I don't post regularly, but I like to share "video tutorials" which consist of explaining material from a textbook side-by-side with an interactive coding session in a jupyter notebook. Judging by the comments, people like that approach a lot.
I have a bunch of others in "draft mode" in the works, and I hope to keep making more, as I find these sessions are very useful for me to organize my thoughts in front of an "imagined" audience.