If there's a goal you're working on that looks like it's going to take a lot of time and effort to achieve, spend a good chunk of time thinking about much faster ways to accomplish the goal before taking the slow route. Quick fixes and shortcuts aren't always bad.
Try to think critically about everything, not just the things you and the people you know of habitually think critically about.
Don't ignore obvious, commonsense explanations in an effort to be interesting. Keep in mind that the world is a complicated place and there's lots you don't know. Apparently hedgehogs (people who make confident, frequently wrong predictions based on simple models) are more likely to get media attention (and, based on my observations, internet attention as well). So, as a corollary, if you're thinking something outrageous, that idea likely found its way to you because it's outrageous, not because it's accurate.
This is an extension of a comment I made that I can't find and also a request for examples. It seems plausible that, when giving advice, many people optimize for deepness or punchiness of the advice rather than for actual practical value. There may be good reasons to do this - e.g. advice that sounds deep or punchy might be more likely to be listened to - but as a corollary, there could be valuable advice that people generally don't give because it doesn't sound deep or punchy. Let's call this boring advice.
An example that's been discussed on LW several times is "make checklists." Checklists are great. We should totally make checklists. But "make checklists" is not a deep or punchy thing to say. Other examples include "google things" and "exercise."
I would like people to use this thread to post other examples of boring advice. If you can, provide evidence and/or a plausible argument that your boring advice actually is useful, but I would prefer that you err on the side of boring but not necessarily useful in the name of more thoroughly searching a plausibly under-searched part of advicespace.
Upvotes on advice posted in this thread should be based on your estimate of the usefulness of the advice; in particular, please do not vote up advice just because it sounds deep or punchy.