One trick to working at speed with Lightroom is to know a few essential keyboard shortcuts. But a command that’s essential to one user is something that another person might never require!
Luckily Lightroom’s menus show the keyboard shortcuts so you can memorize those you need most, but here is my suggestion for those most worth learning. I don’t aim to provide a comprehensive list. After all, Lightroom offers shortcuts for almost every activity and life’s too short to bother with some of the more obscure ones.