This Ableton tutorial walks through the core browser and track-creation shortcuts that keep your session moving without breaking focus. Pressing Cmd/Ctrl+F opens the browser search, and once results appear, arrow keys let you audition sounds directly over your composition before committing to anything.
Dragging a clip into an empty space automatically creates a new audio track. From there, Cmd/Ctrl+T adds more audio tracks, Cmd/Ctrl+Shift+T adds a MIDI track, and Cmd/Ctrl+Option/Alt+T adds a Return track. Cmd/Ctrl+Z handles undo throughout.