This walkthrough covers the basic clip-editing moves inside Ableton Live's Arrangement View, the kind of muscle-memory stuff that speeds up every arranging session. Clicking into empty arrangement space drops an Insert Marker you can drag to select a time range across one or several tracks, useful for isolating a section before editing it.
Moving clips is just click and drag to a new song position, and you can shift a MIDI or audio clip to a different track as long as it's the same clip type. Drag a clip into empty space below your tracks and Live duplicates the originating track automatically, a quick way to branch out a variation without building a new track from scratch.
Resizing is handled by dragging a clip's left or right edge to trim or extend it, with clips snapping to the edit grid by default. Hold Cmd on Mac or Alt on Windows while dragging to temporarily bypass that grid, giving you free, unquantized placement when you need a clip to land somewhere the grid doesn't allow.