diff --git a/README.md b/README.md
index 1768639..3e1cd93 100644
--- a/README.md
+++ b/README.md
@@ -25,14 +25,13 @@ In the future it should have apps that work using SQL, SDL and even web requests
 
 ``` C++
 MultiApp/            // Core application files
-├── src/             // C++ Source Files
-│   └── include/     // C++ Header Files
-│
-├── res/             // Misc Resources
-│   └── gtk/         // Gtk UI Resources
+├── include/         // C++ Project and Test Header Files
+├── src/             // Main C++ Project Source Files
+├── resources/       // Misc Resources
+│   │── gtk/         // Gtk UI Resources
+│   └── screenshots/ // README Screenshots
 │
 └── tests/           // Test Source Files
-    └── include/     // Tests Header Files
 ```
 
 ## 🗺️ Roadmap
@@ -99,13 +98,13 @@ and run with ```sudo docker run -it --rm -e DISPLAY=$DISPLAY --network host -v /
 Here are some screenshots of the funtioning app on Linux.
 
 Fresh window when opening browser app:
-![Browser App](https://github.com/dxchel/MultiApp/blob/main/res/screenshots/fresh_window.png)
+![Browser App](https://github.com/dxchel/MultiApp/blob/main/resources/screenshots/fresh_window.png)
 
 Window after adding directions and returning to project repo in URL history, notice both back and forward buttons enabled:
-![Added some directions and returned to project Repo](https://github.com/dxchel/MultiApp/blob/main/res/screenshots/multiapp_repo.png)
+![Added some directions and returned to project Repo](https://github.com/dxchel/MultiApp/blob/main/resources/screenshots/multiapp_repo.png)
 
 Fractal app window:
-![Fractal App](https://github.com/dxchel/MultiApp/blob/main/res/screenshots/fractal.png)
+![Fractal App](https://github.com/dxchel/MultiApp/blob/main/resources/screenshots/fractal.png)
 
 Chat app window:
-![Chat App](https://github.com/dxchel/MultiApp/blob/main/res/screenshots/chat.png)
+![Chat App](https://github.com/dxchel/MultiApp/blob/main/resources/screenshots/chat.png)
diff --git a/src/include/browser_app.hpp b/include/browser_app.hpp
similarity index 97%
rename from src/include/browser_app.hpp
rename to include/browser_app.hpp
index 6f9dfbd..e268550 100644
--- a/src/include/browser_app.hpp
+++ b/include/browser_app.hpp
@@ -20,7 +20,7 @@ class Browser : public Gtk::Box {
     /**
      * @brief Creates Browser object with all needed Widgets and signals.
      *
-     * Creates Browser object using res/gtk/browser_app.ui file,
+     * Creates Browser object using resources/gtk/browser_app.ui file,
      * Checks for file issues, gets Widgets and connects needed signals.
      */
     Browser();
diff --git a/src/include/chat_app.hpp b/include/chat_app.hpp
similarity index 96%
rename from src/include/chat_app.hpp
rename to include/chat_app.hpp
index 80598be..e529e65 100644
--- a/src/include/chat_app.hpp
+++ b/include/chat_app.hpp
@@ -20,7 +20,7 @@ class Chat : public Gtk::Box {
     /**
      * @brief Creates Chat object with all needed Widgets and signals.
      *
-     * Creates Chat object using res/gtk/chat_app.ui file,
+     * Creates Chat object using resources/gtk/chat_app.ui file,
      * Checks for file issues, gets Widgets and connects needed signals.
      */
     Chat();
diff --git a/src/include/fractal_app.hpp b/include/fractal_app.hpp
similarity index 98%
rename from src/include/fractal_app.hpp
rename to include/fractal_app.hpp
index 5dab490..7e10e02 100644
--- a/src/include/fractal_app.hpp
+++ b/include/fractal_app.hpp
@@ -173,7 +173,7 @@ class Fractal : public Gtk::Box {
     /**
      * @brief Creates FractalBox object with all needed Widgets and signals.
      *
-     * Creates FractalBox object using res/gtk/fractal_app.ui file,
+     * Creates FractalBox object using resources/gtk/fractal_app.ui file,
      * Checks for file issues, gets Widgets and connects needed signals.
      */
     Fractal();
diff --git a/include/main_application.hpp b/include/main_application.hpp
new file mode 100644
index 0000000..6fa468a
--- /dev/null
+++ b/include/main_application.hpp
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <gtkmm.h>
+
+
+/**
+ * @brief MainApplication class containing other apps in project.
+ *
+ * Gtk::Application that initializes a window containing needed
+ * Widgets for containing core apps in the project and running functions.
+ */
+class MainApplication : public Gtk::Application {
+    friend class MainApplicationTest;
+    friend class MainApplicationTest_MainApplicationStructureTest_Test;
+
+public:
+    Gtk::Label *status_label{};
+
+    /**
+     * @brief Creates RefPtr using class constructor.
+     *
+     * @return New MainApplication object RefPtr.
+     */
+    static Glib::RefPtr<MainApplication> create();
+
+private:
+    Gtk::ApplicationWindow *main_window{};
+    Gtk::Box               *selected_app{};
+
+    std::vector<std::pair<std::string, std::function<Gtk::Box*()>>> apps{};
+
+    /**
+     * @brief Creates ApplicationWindow to show.
+     *
+     * Creates and populates the main ApplicationWindow using
+     * resources/gtk/main_app.ui file as base and adding Apps into it.
+     *
+     * @return New ApplicationWindow to use in the program.
+     */
+    Gtk::ApplicationWindow* create_window();
+
+    /**
+     * @brief Creates MainApplication object with application id and handles.
+     */
+    MainApplication();
+
+    /**
+     * @brief Presents main window.
+     */
+    void on_activate() override;
+};
diff --git a/src/include/session.hpp b/include/session.hpp
similarity index 100%
rename from src/include/session.hpp
rename to include/session.hpp
diff --git a/tests/include/tests.hpp b/include/tests.hpp
similarity index 94%
rename from tests/include/tests.hpp
rename to include/tests.hpp
index 40ffba6..32f2f1a 100644
--- a/tests/include/tests.hpp
+++ b/include/tests.hpp
@@ -1,9 +1,9 @@
 #pragma once
 
-#include "../../src/include/main_application.hpp"
-#include "../../src/include/browser_app.hpp"
-#include "../../src/include/fractal_app.hpp"
-#include "../../src/include/chat_app.hpp"
+#include "main_application.hpp"
+#include "browser_app.hpp"
+#include "fractal_app.hpp"
+#include "chat_app.hpp"
 
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
diff --git a/res/gtk/browser_app.ui b/resources/gtk/browser_app.ui
similarity index 100%
rename from res/gtk/browser_app.ui
rename to resources/gtk/browser_app.ui
diff --git a/res/gtk/chat_app.css b/resources/gtk/chat_app.css
similarity index 100%
rename from res/gtk/chat_app.css
rename to resources/gtk/chat_app.css
diff --git a/res/gtk/chat_app.ui b/resources/gtk/chat_app.ui
similarity index 100%
rename from res/gtk/chat_app.ui
rename to resources/gtk/chat_app.ui
diff --git a/res/gtk/fractal_app.ui b/resources/gtk/fractal_app.ui
similarity index 100%
rename from res/gtk/fractal_app.ui
rename to resources/gtk/fractal_app.ui
diff --git a/res/gtk/main_app.ui b/resources/gtk/main_app.ui
similarity index 100%
rename from res/gtk/main_app.ui
rename to resources/gtk/main_app.ui
diff --git a/res/screenshots/chat.png b/resources/screenshots/chat.png
similarity index 100%
rename from res/screenshots/chat.png
rename to resources/screenshots/chat.png
diff --git a/res/screenshots/fractal.png b/resources/screenshots/fractal.png
similarity index 100%
rename from res/screenshots/fractal.png
rename to resources/screenshots/fractal.png
diff --git a/res/screenshots/fresh_window.png b/resources/screenshots/fresh_window.png
similarity index 100%
rename from res/screenshots/fresh_window.png
rename to resources/screenshots/fresh_window.png
diff --git a/res/screenshots/multiapp_repo.png b/resources/screenshots/multiapp_repo.png
similarity index 100%
rename from res/screenshots/multiapp_repo.png
rename to resources/screenshots/multiapp_repo.png
diff --git a/src/browser_app.cc b/src/browser_app.cc
index c13a255..c90a8aa 100644
--- a/src/browser_app.cc
+++ b/src/browser_app.cc
@@ -1,4 +1,4 @@
-#include "include/browser_app.hpp"
+#include "../include/browser_app.hpp"
 
 #include <iostream>
 #include <regex>
@@ -11,7 +11,7 @@ Browser::Browser() : Gtk::Box(Gtk::Orientation::VERTICAL) {
     // Load the GtkBuilder file and instantiate its widgets, check for errors
     auto ref_builder {Gtk::Builder::create()};
     try {
-        ref_builder->add_from_file("res/gtk/browser_app.ui");
+        ref_builder->add_from_file("resources/gtk/browser_app.ui");
     } catch(const Glib::FileError& ex) {
         std::cerr << "FileError: " << ex.what() << std::endl;
         throw ex;
diff --git a/src/chat_app.cc b/src/chat_app.cc
index 7fb45ce..547ffc8 100644
--- a/src/chat_app.cc
+++ b/src/chat_app.cc
@@ -1,5 +1,5 @@
-#include "include/chat_app.hpp"
-#include "include/session.hpp"
+#include "../include/chat_app.hpp"
+#include "../include/session.hpp"
 
 #include <gtkmm.h>
 #include <iostream>
@@ -11,7 +11,7 @@ Chat::Chat() : Gtk::Box(Gtk::Orientation::VERTICAL) {
     // Load the GtkBuilder file and instantiate its widgets, check for errors
     auto ref_builder {Gtk::Builder::create()};
     try {
-        ref_builder->add_from_file("res/gtk/chat_app.ui");
+        ref_builder->add_from_file("resources/gtk/chat_app.ui");
     } catch(const Glib::FileError& ex) {
         std::cerr << "FileError: " << ex.what() << "\n";
         throw ex;
@@ -61,7 +61,7 @@ Chat::Chat() : Gtk::Box(Gtk::Orientation::VERTICAL) {
 
     // Add css to the default display
     auto css_provider = Gtk::CssProvider::create();
-    css_provider->load_from_path("./res/gtk/chat_app.css");
+    css_provider->load_from_path("./resources/gtk/chat_app.css");
 
     Gtk::StyleContext::add_provider_for_display(
         Gdk::Display::get_default(),
diff --git a/src/fractal_app.cc b/src/fractal_app.cc
index c82e96b..f5564df 100644
--- a/src/fractal_app.cc
+++ b/src/fractal_app.cc
@@ -1,4 +1,4 @@
-#include "include/fractal_app.hpp"
+#include "../include/fractal_app.hpp"
 
 #include <iostream>
 #include <any>
@@ -164,7 +164,7 @@ Fractal::Fractal() : Gtk::Box(Gtk::Orientation::HORIZONTAL) {
     // Load the GtkBuilder file and instantiate its widgets, check for errors
     auto ref_builder {Gtk::Builder::create()};
     try {
-        ref_builder->add_from_file("res/gtk/fractal_app.ui");
+        ref_builder->add_from_file("resources/gtk/fractal_app.ui");
     } catch(const Glib::FileError& ex) {
         std::cerr << "FileError: " << ex.what() << std::endl;
         throw ex;
diff --git a/src/include/main_application.hpp b/src/include/main_application.hpp
index 252c273..6fa468a 100644
--- a/src/include/main_application.hpp
+++ b/src/include/main_application.hpp
@@ -33,7 +33,7 @@ class MainApplication : public Gtk::Application {
      * @brief Creates ApplicationWindow to show.
      *
      * Creates and populates the main ApplicationWindow using
-     * res/gtk/main_app.ui file as base and adding Apps into it.
+     * resources/gtk/main_app.ui file as base and adding Apps into it.
      *
      * @return New ApplicationWindow to use in the program.
      */
diff --git a/src/main.cc b/src/main.cc
index b261b60..252da1f 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,4 +1,4 @@
-#include "include/main_application.hpp"
+#include "../include/main_application.hpp"
 
 
 int main(int argc, char** argv) {
diff --git a/src/main_application.cc b/src/main_application.cc
index 711b05f..7525cb8 100644
--- a/src/main_application.cc
+++ b/src/main_application.cc
@@ -1,8 +1,8 @@
-#include "include/main_application.hpp"
+#include "../include/main_application.hpp"
 #include "gtkmm/object.h"
-#include "include/browser_app.hpp"
-#include "include/fractal_app.hpp"
-#include "include/chat_app.hpp"
+#include "../include/browser_app.hpp"
+#include "../include/fractal_app.hpp"
+#include "../include/chat_app.hpp"
 
 #include <iostream>
 
@@ -28,7 +28,7 @@ Gtk::ApplicationWindow* MainApplication::create_window() {
     // Load the GtkBuilder file and instantiate its widgets, check for errors
     auto ref_builder {Gtk::Builder::create()};
     try {
-        ref_builder->add_from_file("res/gtk/main_app.ui");
+        ref_builder->add_from_file("resources/gtk/main_app.ui");
     } catch(const Glib::FileError& ex) {
         std::cerr << "FileError: " << ex.what() << std::endl;
         throw ex;
diff --git a/src/session.cc b/src/session.cc
index e9bec2d..f9f8581 100644
--- a/src/session.cc
+++ b/src/session.cc
@@ -1,4 +1,4 @@
-#include "include/session.hpp"
+#include "../include/session.hpp"
 
 #include <iostream>
 #include <vector>
diff --git a/tests/browser_app_tests.cc b/tests/browser_app_tests.cc
index df4b543..b31dabd 100644
--- a/tests/browser_app_tests.cc
+++ b/tests/browser_app_tests.cc
@@ -1,4 +1,4 @@
-#include "include/tests.hpp"
+#include "../include/tests.hpp"
 
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
diff --git a/tests/chat_app_tests.cc b/tests/chat_app_tests.cc
index 0fe8316..5ef39c5 100644
--- a/tests/chat_app_tests.cc
+++ b/tests/chat_app_tests.cc
@@ -1,4 +1,4 @@
-#include "include/tests.hpp"
+#include "../include/tests.hpp"
 
 #include <gtkmm.h>
 #include <regex>
diff --git a/tests/fractal_app_tests.cc b/tests/fractal_app_tests.cc
index efd7668..2cc4b9c 100644
--- a/tests/fractal_app_tests.cc
+++ b/tests/fractal_app_tests.cc
@@ -1,4 +1,4 @@
-#include "include/tests.hpp"
+#include "../include/tests.hpp"
 
 #include <random>
 
diff --git a/tests/main.cc b/tests/main.cc
index d6bb779..a3416de 100644
--- a/tests/main.cc
+++ b/tests/main.cc
@@ -1,4 +1,4 @@
-#include "include/tests.hpp"
+#include "../include/tests.hpp"
 
 #include <gtest/gtest.h>
 
diff --git a/tests/main_application_tests.cc b/tests/main_application_tests.cc
index eddcc14..b50ef02 100644
--- a/tests/main_application_tests.cc
+++ b/tests/main_application_tests.cc
@@ -1,4 +1,4 @@
-#include "include/tests.hpp"
+#include "../include/tests.hpp"
 
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>