The following nGram suggests that dos and donts, do's and don'ts, and do's and don't's are all used, but it appears that do's and don'ts takes the cake. A quick search suggested that capitalizing all but the s is also fairly popular:
I want to write "dos and don'ts", or an equivalent expression, in a university essay. I am assuming that it is not very academic to write "dos and don'ts", so does anyone have a better way of putti...
phrase requests - Formal alternative for "dos and don'ts" - English ...
The other quotations use these spellings: Fair do's, fair do's, fair dos, Fair do, fair do's. The first of these is from 1941: 1941 L. A. G. Strong Bay 168 Come on, Doctor. Fair do's. The spellings are usually a variation of the noun do (under which the phrase is listed in the OED), because a do is something done, a dealing or treatment.
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Four Colors lets you play the popular card game for free in your web browser. Your objective is to be the first player with no cards, similar to other Crazy Eights-style card games. Play a game like UNO in multiplayer with 2, 3, or 4 players.
Uno Online is a video strategy game for multiplayer. Players own cards with 9 numbers, 4 colors, and special functions to compete and win by removing all first.
UNO is Nebraska's metropolitan university — a university with strong academic values and significant relationships with our community that transforms and improves life.