Double-clicking the edge or corner of a window (anywhere a double-headed arrow cursor shows up) will resize it to the edge of the screen.

Hovering over the green dot in the title bar will bring up some simple window tiling options.

https://support.apple.com/guide/macbook-air/manage-windows-o... has more to say on the subject, more recent versions of the OS than I use have added more stuff in this vein, personally I just use Moom and have been for years.