If you’re fiddling with canvas shapes and the corners are looking a little too default, this kirupa walkthrough on modifying how corners look is a clean way to get past the usual rectangle sadness.
LineJoin is one of those tiny canvas knobs that makes stuff look instantly more “designed” — miter corners can spike in weird ways at sharp angles, so I usually flip to round or bevel unless I’m deliberately going for that sharp technical look. it’s like tuning an instrument: the note is “correct” either way, but one setting just feels less harsh.