Every day each of us discover something new in guild chat that others have known about forever that have the potential to change our SWTOR lives for the better. This thread will serve as a collection of those "I wish I'd have known that from day 1!!!!" moments.
My first contribution: autorun. It's default toggle is NUM LOCK and it allows your character to run automatically. Take note if you use a mouse (i.e. Naga) that binds to the NUM LOCK keys...your buttons won't work when you toggle NUM LOCK. Make sure you stop auto-running via NUM LOCK lest you wind up in the middle of a fight with no working side buttons.
My second contribution: companion quickslot bar. Expand your companion's quickslot bar from time to time to see what is there. There are additional abilities you may not be aware of that aren't toggled for them to be using automatically (or some toggled for automatic use you'd rather have off or just situational).