Before I switched to a tiling window manager, I had my global shortcuts in KDE set up with all the available quick-tiling actions. Win+S would maximize a window, Win+{W,A,D,X} would move and resize the window to cover the {upper,left,right,bottom} half to the screen, and Win+{Q,E,Z,C} would similarly move and resize the window to one of the screen's quadrants. The shortcuts seem arbitrary, but are deliberately chosen to arrange into a nice square on the keyboard. That setup worked nicely for me for several years, until I converted to a true tiling window manager (Sway).

Even just using shortcut keys to tile windows is better than using a mouse.