Is there a page somewhere?

Someone knows if there's any page where you have an overview of all minecraft commands. Because I would like to make a list. So for Java edition. Some youtubers, for example, use some commands that are damn long. I mean you don't come up with something like that on your own.

Type / help or / list then you will find commands

The best thing to do is take a look around here

https://minecraft-de.gamepedia.com/...com/Befehl