If you're interested in learning tips or tricks in ZZT for your Kaizo-ZZT or ZZT troll levels, there are a few worlds or collections that are really neat for potential building blocks for setups:

ZZT Encyclopedia Online: https://museumofzzt.com/file/z/zeol2002.zip
Doodads 2018: https://museumofzzt.com/file/d/dood2018.zip
2019: https://museumofzzt.com/file/1/2019.zip
Z Lab 2019: https://museumofzzt.com/file/z/ZLAB2019.zip
ZZT Programming Tricks and Techniques: https://museumofzzt.com/file/z/zztptt.zip
zztee: https://museumofzzt.com/file/z/zztee2.zip

And not a ZZT world but the Kangaroo Effects Wiki has a page on some random intricacies and quirks that may be useful: https://rabbitboots.com/kfx/index.php/ZZT_Notes

If anyone's got more links to contribute they're welcome!