If you happen to be using Windows, Narrator has a well-written tutorial (no, I didn't write it) that goes into the most common shortcuts, and you can get a comp

If you happen to be using Windows, Narrator has a well-written tutorial (no, I didn't write it) that goes into the most common shortcuts, and you can get a complete list with Narrator+F1 (the "Narrator" key is either Caps Lock or Insert). I believe VoiceOver on Mac also has a tutorial.