Hey there,
I have searched for the 1.16.x guis docs in mcforge.readthedocs and in the github downloadable docs,
i have not found anything about guis... while guis are mentioned:
"#### GUIs
One of the most common things to do on block activation is opening a GUI. Many blocks in vanilla behave this way, such as chests, hoppers, furnaces, and many more. More about GUIs can be found on [their page](GUIs)."
there is no guis.md file or anything like it... if anyone knows where it is, it will help so much.
thank you