Apologies if this '12 Rules for Life' meme is a bit worn out (I confess to have only just seen it in the last week or so here and here and since I am pretty much absent on most forms of social media these days I have a feeling these kinds of things come and go and I usually don't catch them), but since it reminded me a bit of blogging say, 10 years ago when these kinds of themes were passed around in blog 'tags' and comments, I thought I would give it a shot. 
So here goes - in no order of importance, relevance, research, or general applicability.
And, there are lots of more important rules - like the ones concerning family, relationships, etc. that I have no desire to even try to offer advice, let alone rules. Consider these the most unimportant, but somehow vital 12 rules for life you will ever read. If you read them that is.
And now here goes...
1. Pick up the tab - You don't have to do this all the time, just sometimes. There is nothing more awkward than handing a server or bartender seven different credit cards to try and settle a $132 check. Pick up the tab and you just made six friends. And made a deposit in the bank of good karma. You may need that one day.
2. No talking in a public restroom - with the exception of someone in authority if they need to shout 'The building is on fire, everyone evacuate!'
3. Do whatever you can to control your schedule. Most of us will end up with some kind of job or career where bosses, colleagues, customers, clients, etc. all have some kind of claim on our time. The more you can limit the number of people who can lock up your time and the amount of time you have to be available to others, the more you will be able to focus on what you truly want to do, and I bet you will be happier overall. Call it your own 'Executive Time' if you have to, and block your own calendar.
4. Don't stress over the dessert or the third slice of pizza or the french fries or whatever you consider your dietary weakness. No one ever looks back on their life and says 'Gee, I wish I drank more water and ate more salad.'
5. Jog/walk/move a little bit more. Sometimes when I travel I have to take two pretty long connecting flights in a row. And sometimes I see the some of the same people get off the first plane, where we had all been sitting for three hours or so, and immediately park themselves down in another seat to wait an hour just to get on another three hour flight where once again, we will all be sitting. It baffles me. And while you are at it, you don't need to find the closest parking space to the grocery store or post office or theater. Park a little farther out and walk for two minutes. It's fun.
6. Never place a bet on any animal that can't talk. Betting on ones that can talk is also advised against, but it is fun. Except for tennis. Don't bet on tennis, it is pretty likely the match is fixed.
7. Don't spend too much time on social networks. I know, that 'rule' is everywhere. But even Zuckerberg has admitted that Facebook (heavy use of Facebook anyway), is not that great for you. Check it like you check your snail mail - a quick scan for a minute as you bring it in from the mailbox and then maybe for 15-20 minutes later as you sort out what is important, what can be trashed and what you need to read. Reading long lists on blogs is, however, very admirable and good for you. So keep doing that. Well done.
8. Sign up for TSA Pre-check. Even if you only travel a few times a year it is worth every cent.
9. Figure out the three things or types of work that you like to do the most, (or which you want to become more proficient), and make sure you reserve time every week to work on these three things. Keep (loose) track of the time you spend on these things and do a kind a self-audit every few months to determine two things. One, are you actually making time to do the things you really want to do? And two, are you getting better at these things? I think the thing that holds us back the most at work and maybe even in life, is that we are not good or comfortable with self-examination and making an honest assessment of things. If that sounds like a bit of a confession/admission you are right.
10. Set expectations (where you can). In a project or a negotiation or even just 'normal' business, people are generally going to be happy or at least satisfied as long as they are not disappointed or surprised. If you have to, set an email auto-responder during your busy times, (maybe all the time), that lays out when people can expect to hear back from you or the time it will take for you to take some action. If you email me today, (it's a Thursday as I write this), and I auto-respond I will get back to you by Monday COB, then at least you understand not to expect a reply on Friday. This is also a confession/admission of sorts.
11. It's ok to be a snob about something, (wine, beer, cheese, movies, books, etc.) but not everything. Popular culture is called that because it's you know, popular. Lots and lots of people drink Coors Light, eat at Taco Bell, and go on Dunkin' runs. Jumanji grossed about $340M in 2017. And the people that drink Coors Light and hit the Taco Bell on the way to catch Jumanji? You have to work with them, serve them as customers, and socialize with them. You are not any better than them because you like some triple-hopped craft IPA that was brewed in someone's backyard.
12. Don't listen to anyone's rules about how to live. Except for number 8 above. You will never regret not waiting in the 'regular' line at security.
If you decide to post your '12 Rules' somewhere let me know in the comments, or add a rule or two of your own there.
Have a great day!