They integrated it into the engine. If you have your mouse over any blueprint it tells you the definition of it.
What helped me was when you’re editing any type of blueprints you can press the window button on the toolbar. One of the windows is called Palette. It’s a list of every blueprint you can use. I just read them all from there. Side note, I would learn the utilities section first becuse it’s 70% of what you’ll use all the time.
The other thing that helped was the blueprint editor cheatsheet. It’s the hotkeys for the most common blueprints. Blueprint Editor Cheat Sheet | Unreal Engine Documentation