Animating in FCP
Complex animations should be done in After Effects or some other animation program. But FCP can handle simple animation.
Go to the controls for anything you want to animate and find the little diamond at the far right of the value.
Click it and it will turn yellow.
You have now turned on animation for Position.
Move the time marker to some other time, and change the position values to something else.
Animation is always change through time, so you need to change to a different time, and then change the thing.
You can animate the value of effects, position, scale, whatever you want to change over time.