Win32 API Tutorial => Getting started with Win32 API
https://riptutorial.com/winapiWinAPI (also known as Win32; officially called the Microsoft Windows API) is an application programming interface written in C by Microsoft to allow access to Windows features. The main components of the WinAPI are: WinBase: The kernel functions, CreateFile, CreateProcess, etc. WinUser: The GUI functions, CreateWindow, RegisterClass, etc.
Windows API - Wikipedia
https://en.wikipedia.org/wiki/Windows_APIThe Windows API, informally WinAPI, is Microsoft's core set of application programming interfaces (APIs) available in the Microsoft Windowsoperating systems. The name Windows API collectively refers to several different platform implementations that are often referred to by their own names (for example, Win32 API); see the versions section. Almost all Windows programs interact with the Windows API. On the Windows NT line of operating systems, a small number (s…