Things like don’t shake a baby (babies love to be bounced and rocked, which are honestly just gentle shaking, but even moderately vigorous shaking can seriously injure or kill an infant and you should never shake a baby in anger or anything like that) or don’t take anything with you when exiting a building when a fire alarm goes off (don’t go looking for things, but you should still put your coat on if it’s next to you and it’s cold out). What other common maxims are generally good to follow, but over exaggerated? Bonus points if it’s only a well known saying because our instinct is to do the thing, like with rocking babies.
(Please don’t think I’m telling you to shake babies or look for and carry huge stacks of files out of a burning building)
Don’t judge a book by its cover
Ooh, that’s a good one! You should keep an open mind because people will surprise you, but generally people try to coordinate their outward appearance with their character. Again, not always because lots of things can impede that (clothing, health or financial restrictions, for example) and some people intentionally try to appear different from how they are.
He’s talking about books.