So one of the first things I found online, that I've gone back to multiple times and will continue to do so, is a great website by this fella, Rick Peterson. He is giving away his knowledge of Photoshop Elements in easy to understand tutorials. Be sure and sign up for his email newsletter. He immediately starts sending you tips, the first few including videos, complete with printable cheat sheets for some simple commands.
Yes, some I'd already figured out. However after years of using Elements, I'm only now using "shift-tab" to remove everything from the screen except the top menus & toolbar, giving me my whole screen to work on a large image.
Who knew?! Well no doubt lots of folks, but not I. Thank you Mr. Peterson!!!
Check it out:
http://www.essential-photoshop-elements.com/index.html