cmd+c for copy
cmd+v for paste though you probably new those
cmd+shift+4 for when you want to take a screen shot of a certain area
one thing i see with a lot of mac users they either don't know how to resize their dock, or they have really poor eye site and keep them huge
incase you want to resize it, click the apple in the top left of your computer screen then system preferences, then click on dock and mess with the settings.