Wikipedia defines common sense as “knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument”
Try to avoid using this topic to express niche or unpopular opinions (they’re a dime a dozen) but instead consider provable intuitive facts.
To tilt your head back if you have a blood nose.
This is no longer recommended advice, because you end up drinking the blood which causes vomiting.
Way to stop them is put ice over the back of neck, plug nose with tissue and clear clots each 2 mins.