When placing satchel charges, check so there aren't any teammates next to them. This is the most common form of friendly fire. The same should be said to anyone else, if you hear someone say they're placing explosives, get out of the way.
Think before placing ziplines. Is there another way? Is it a better option like digging? See what your driller does if there is one, maybe he's going to create a tunnel instead. If it's just a short gap that's too far to jump, perhaps an Engineer will bridge it.
Try to keep atleast one zipline for when you extract, they often become very important and can make or break a mission.