it's apart of animation making, since I am a animator myself, fps is frames per second/how fast a animation is. like a animation with 14 frames and 7 fps, the animation would be 2 seconds long
Oh yeah
Well if u press the play button
Then next from it is a clock-icon if u press that
U can move to a rabbit-icon or a turtle- ig you know what that means
Slower, or faster
I hope this helped you ^^