Ableton's tutorial channel walks through the Quantize transformation in Live 12, showing how to tighten a drum pattern by snapping notes to the current grid or a custom timing, with a knob to dial in the amount of quantization applied.
One key workflow distinction covered here: live transformations print changes instantly into the clip as you adjust, while turning the transform button off lets you preview and manually commit each change using the arrow button or a keyboard shortcut. Knowing which mode you're in prevents accidental overwrites.
The bit closes with a practical example of isolating just the kick drum and applying quantize at 100%, showing how selective quantization can tighten one element without locking the whole pattern to the grid.