One that I hear a lot is that you must never put a 90-degree angle on a trace. Some fear the mere sight of a 90-degree angle on a PCB tells everyone you don’t know what you’re doing.

Imagine driving straight, then halting to make a 90-degree L-shaped turn - without any warning signs - and then hoping the car doesn't kiss the wall. Locals now jokingly call it not a bridge, but ...

It's easy to rotate a picture on your iPhone directly in the Photos app. You can rotate a picture at a 90-degree angle, automatically turning it on its side or flipping the photo upside down.