My favourite thing about live is how quick it can be and how easily you can get ideas into songs, so heres just some keyboard shortcuts that will make your life alot easier :)
Ctrl + X = Cut - pretty useful for moving things about and I usually just use it instead of delete cause its quicker
Ctrl + D = Duplicate - probably my most used one, lets you duplicate clips, automations, tracks etc.
Ctrl + I = Insert Time - inserts blank bars equal to your selection, behind your selection
Ctrl + Shift + M = Insert MIDI Clip
Ctrl + N = New Audio Track
Ctrl + M = New MIDI Track
TAB = Switch session/arrange view
Ctrl + L = Loop selection
Ctrl + G = Group - group tracks, audio effects, and instruments
Ctrl + R = Rename - rename clips, tracks, locators and helps keep things organised
Ctrl + Shift + X = Cut Time - very useful if you want to delete a whole section and it copies to the clipboard
Ctrl + J = Consolidate - MEGA useful if you don't have ultra CPU, you can consolidate multiple MIDI/audio clips together (in the same track) and when used on audio clips, cuts the whole sample to that clips size and applies any pitch/volume or other effects done inside the audio clip.
0 = Deactivate/Reactivate clips - lets you inactivate clips so you can hear the track without them. Useful also for keeping a sample ready in arrangement view but not having it play.
Ctrl + Alt + Drag with Mouse = Lets you drag the whole arrangement window about vertically and horizontally
Alt + Mouse = lets you override the grid and select exactly where the mouse clicks
Ctrl + Shift + F = Follow - follow song position, used to just be Ctrl + F in versions below 9
Another useful tip is that when you drag with your mouse to make a selection, if you drag above the scrub area - everything upwards will be selected and vice versa if you drag below the master track (or audio effects section). Useful for copy-pasting large sections of a track.
Holding ALT on before clicking on an automation line lets you make a curve
On an audio track, you can select as the input type, 'Resampling'. If you then arm the track you can record any sounds coming out of the master track. You can use this to resample basses, consolidate a whole drum loop or just apply effects done to something into an audio clip.
anyways, thought I'd contribute to this thread properly