Completely New to ImGUI

I am completely new in the world of GUI and want to learn how to setup ImGUI in my Desktop.
I have downloaded ImGUI master files, i want to know what to do with it.
They are basically just C++ files and header.
I tried opening the ImGUI in Codeblocks and Compiling it yield near 100 errors.
I really need help getting started with making a basic gui with text and button.
is there an app or environment which can help me understand the basics.

Try opening one of the examples in Visual Studio Code. There are projects already configured for it in the examples folder. Try the GLFW OpenGL 2 one specifically since essentially all devices support opengl2 and ImGui has the gl3w.c file already setup for compilation.