Magnet does a much better job than the very limited options that MacOS has built in. It has menu/key commands for half-screen, quarter-screen, third-screen, and

Magnet does a much better job than the very limited options that MacOS has built in. It has menu/key commands for half-screen, quarter-screen, third-screen, and sixth-screen as well as maximizing without taking over the menu bar. It also has snap by dragging which can be used for all of these different fractions, although I almost always just use it for left/right half or full.