If you are interested in learning demoscene stuff, Revision 2023 which is about to take place in roughly two weeks, features some workshops in this regard also available as online streams.
I'm the author of the article, and I'll be at Revision. I'll give a seminar on shader minification -- another topic not discussed in the article.
For seminars, I'd suggest to take a look at seminars from previous years. They are on YouTube (https://www.youtube.com/@revisionparty/playlists) and you should be able to find something that matches your interest.