The documentation, particularly for c++ leaves a lot to be desired, googling things and hoping for any documentation to pop up is the best way to find documentation in my experience.
I recommend learning from youtube or ue5 forums. If you need to view the documentation (for reasons like viewing parameters) and are having a difficult time, posting on the forum asking for resources/concept names works well.
Another step you can take before you go to the forum to post is creating a blueprint and double clicking it to view the node with visual studio, if you have proper workplace integration set up this lets you reverse engineer it a bit more 