How to create individual Objects out of Object with applied Array Modifier? When I watched some tutorial videos, they often use outdated commands.

Most of the time I can find the ones for the current version on the internet but I have not been able to find the command for turning an array into individual objects.
Just click on the Apply button in the Array Modifier panel. If that gives you all the meshes as a single object, which it seems to, then go into edit mode, Select All, then press P to separate all loose parts into separate objects.