PTE is very easy to use, the best thing is that everything you do is virtual, so you can't destroy your pictures or sound files.
The best way to learn is just to try things & see what they do.
Don't get hung up on the numbers, just move things with the mouse & see the effect. Also try a Right Click if you are looking for something, it usually brings up options to do what you want.
There is unlimited Undo so it is easy to step back if something doesn't work as expected.
Have fun & play until you get used to it, then you will discover just how powerful PTE is.
Jill