I was not sure where to post this information - I hope it is in the correct place.
Information about programming in C has become difficult to find on the web. There are standard resources such as Microsoft's information pages (most of these pages provide code for C++ that can usually be used in Pelles C). Recently, I came across a useful website that shows how to use Windows API functions in Pelles C at:
https://zetcode.com/gui/winapi/Although this website is aimed at beginners, it contained some useful snippets that I found useful. The site was recently updated (October 2023) and it contains a lot of code that works in Pelles C.
I hope this information is useful.