Another keyboard-only method which I haven't seen mentioned yet, that I learned in Windows but seems to work well even in Linux, is to press alt+space and then

Another keyboard-only method which I haven't seen mentioned yet, that I learned in Windows but seems to work well even in Linux, is to press alt+space and then 'm' followed by arrow keys to move the window around, or 'r' followed by arrow keys to resize the window For people like me on laptops with trackpads, these keyboard shortcuts work really well.