What node presets all excists? Confused how to discover them...

I have a Unity background. I am learning UE and doing a lot of tutorials. But what I notice is there are a lot of prebuild functions that I can add to my Object.

For example: I am following a thrd person tutorial where i have to make a moving platform that moves from A to B. In the tutorial he explains that you can add a interpelateToMovement to the object which has all the finctionallity in it. Now I would never have known this if I didn’t follow the tutorial.
In Unity I would have created this script myself from scratch.

How many more of these prebuild functions are there? And how do I know what is already built or what has to be build from scratch?

Is there some kind of overview of this?

Hope someone can lead me in the right direction.

As a starting point, you could browse the Blueprint docs here:

Blueprints Visual Scripting in Unreal Engine | Unreal Engine 5.1 Documentation
Unreal Engine Blueprint API Reference | Unreal Engine Documentation

Sure, it’s overwhelming at first, but you’re on the right path already by following tutorials. It’s like with any other programming language, you have to gain experience by looking at examples and toying around, searching the web for answers etc. until you reach that point where it comes naturally while writing code. Give yourself that time of learning.