I'm a big fan of keyboard shortcuts. Once they've been memorized and committed to your muscle memory, keyboard shortcuts can speed up your work considerably. In a recent series of posts on SetUpABlogToday, a fellow named Jamie shared a handy infographic detailing all of the most helpful keyboard shortcuts for Adobe's Creative Cloud applications. Here's a piece of that graphic, which covers most everything you'd need to know for Premiere and After Effects.
Of course, these are the default keyboard shortcuts that come standard in Premiere Pro and After Effects. If you're just starting out with either of these programs, you may as well just learn the standard set since you haven't already put in the effort to learn the shortcuts from another app. However, if you're coming to Premiere Pro CC from another NLE or an earlier version of the software, you can always setup the program to use the keyboard presets that you already know. Or, if you're like me, you can create your own custom set of keyboard shortcuts that you can take with you wherever you go. Mine's a weird amalgamation of Avid and FCP7 shortcuts that I have been using for years.
If you're interested in checking out the keyboard graphics for the other Adobe CC apps, head on over to Jamie's site and check them out. There are also links down below to expanded and downloadable versions of the Premiere Pro and After Effects cheatsheets. Enjoy!