I've been developing documentation for my language. The nice thing about it is that all the code snippets are embedded editor instances that allow you to run and play with the examples.
This week I've been writing a page to document effect types. There one of the key features of it. I've made a video where I play around with them. https://vimeo.com/837681881
Let me know if this does a decent job of explaining effect types, and particularly effect handlers.