The word "don" can mean to put on or wear an article of clothing, like a hat or jacket. It can also refer to someone who is respected and accepted as a leader or expert in a particular field. Full definition
Cause this was a bit too much, even for people don t know what to do with all their money. (evo.co.uk)
I would look at it as don not do anything that you can not document and defend. (biggerpockets.com)
But dating after 50 or 60 demands some precautions, tips and list of don's & don'ts so that you never make a mistake again in your life. (best-datingsitesover50.com)