ProShow often provides more than one method in which to accomplish something. There's much to the program that's hidden (in plain sight) after you've "mastered" the program. Once you feel you've learned all there is to learn about it, you'll find that there's actually more there that you didn't even suspect existed. However, the two key things in ProShow, as far as I'm concerned, that allow you to get the most out of it, are the keyframing and masks.
After those two items are mastered, then, it's a matter of getting used to what the program has to offer ... and creating splendid shows. Tips and hints and such help. If you want some of those, there is the FORUM BOOK located in "Member Created Files." Yes, there is some dated information in there but, Barbara (member of this forum) pulled a bunch of information together from many forum members and other members contributed time and effort to so it could become a reality (putting together such an item is one heck of a lot of effort ... as each involved can attest to). At the time it was compiled, I think it was v3.2 that we were using. However dated the original version of the program might be that the book was written for, there's one heck of a lot of information therein that is highly useful for anyone.
Take a gander at it ... see what you think. There are lots of tips and such (all free) located throughout the form that can help you get the most out of the program. Then, you've got the link I provided which has additional tips. Some of those are for when you get more advanced.
Then, when you get to the point where you think you know the program pretty well, I wrote a book that might interest you ... you can find information about it on the blog site I provided you a link to.
The bottom line tho is that if you just take your time and enjoy what you're doing, the expertise will grow without you realizing it. There's simply too much to learn to do it overnight.
Good luck and HAVE FUN!
Dale