Using Sprite Lab for Final Project

My students are working on their final projects. Most of them are using sprite lab. There are a ton of blocks that they haven’t been introduced to and I can’t seem to find any documentation on the blocks. For example, what does “log message”, “debug sprite true”, and eval mean?

Side note: if you do the final project in the lesson on Course F, there are limited amount of blocks. If you go into create projects and pick sprite lab, there are a lot more blocks you can use. I just need help understanding some of them.