Hi! Looks like the Array modifier is pretty much different in 5.1, could not make it work as shown in the video. Although the legacy one is still available.
Hi Philipp,
You can use the Legacy one, if you're following along with this Course, but the new Array Modifier can do everything the old one could, and then some,, but it's easier and more intuitive (I think). For the example in the Course, you only need the Array Modifier:

It's covered in the first section(modeling) on the what's new in 5.0
Martin! Thank you very much! Mine Array interface is way different from yours... And it is the opposite of intuitive :))) very confusing seeing count and distance for example. But yes - no need for curve modifier this time:
Hi Martin! You are right, that was add on “Modifier list” which apparently screwing up native modifiers’ interface. I removed it and Array got simplified like it’s supposed to be! Thank you!