Which of these buttons adds a customizable camera to the replay?

I recently tried to edit some replays and i feel like i'm missing the very basics of it.
Every tutorial i could find already had the basic setup and was on camera setups and realistic effects.
Isn't there any documentation like the handbooks of the old days where i could find what exactly the "Time" and "Camera" Block are even doing. I feel like i would waste everybodies time asking such basic questions in this forum
