Set control rotation was only used as an example here.
whatever actor you are trying to rotate should be your target. You can use “Set Actor Rotation” or search for “set world rotation” if you are trying to rotate a component within an actor.
control rotation has to do with the player controller - you’ll need to read up on that to understand it, it is not possible to explain in just a few words.
I used a literal float as placeholder for where you would use some variable to determine how much to rotate by.
To be frank, you really ought to follow some beginner tutorials (check out the learn section on the left tab, tons of great tutorials to choose from). These questions you are asking will be answered 10,000x faster if you go through some tutorials, rather than ask one question at a time here.