@Kfawcett responded as I was writing, but echoed my list almost exactly.
Stakk is a really great place to start and want to encourage it as a continued resource. There are plenty of great tutorials, learning platforms, etc. in the Bubble community, each which cater to specific needs.
To expand on @Kfawcett’s post - @leonidas.petrou4 has developed a great foundations of Bubble course. @copilot has developed some really great, in-depth, courses that provide a great deep dive into Bubble. @romanmg has plenty of wonderful tutorial videos (on Youtube and her site) spanning all levels of Bubble expertise. And @airdev has been putting together some great educational materials.
As well, I’ve developed 150+ tutorial videos on LearnTo covering lots of up-skilling concepts on Bubble for beginners through experts.
All of the above I consider to be solid educators on Bubble that continue to develop current and well thought out content.