(A) The best habits are the ones that you want to cultivate, so there’s no universal list.
(B) You noted this fact in your post.
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(C ) You’re asking for input to help spark your own ideas.
In that light, here are some of my most rewarding habit-cultivating goals:
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Brush my teeth every night. I had a Beeminder goal for this until it became a habit; then I archived the BM goal. I still brush my teeth every night, two years on.
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Daily steps. I started tracking these in January 2019 and have consistently raised my daily average from a slothful 2k to a decent 6k a day. (For all of 2019 it was even higher—more on why that was so successful here.) This is probably a “habit” closer to Zed’s description; I’m pretty sure I’d lapse if I stopped using my tracking tools.
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Reading. I don’t need a goal for the actual reading; I’ve always read lots. The habit I’ve cultivated is keeping track of what I read. Thanks to Beeminder, I now have a list going back almost three years.
In terms of philosophizing about what best habits I could cultivate… well, take a look at my goal gallery. Actually, that’s a great idea to answer your question, I think—browse through other people’s goals. Start at the Featured page, and you can click through to any person’s gallery page. That should give you a wealth of ideas, plus if you tally the repeats, an idea of how common some potential habits are (which is one possible metric for evaluating “best”).