One is from the YouTube channel "How to ADHD": put things away, not just down. I was diagnosed in my early 40s and it shed some light on the source of a lot of problems in my life. Letting clutter accumulate has a huge effect on overall mental health.

The other one is a social media thing I picked up years ago that I soon realized applied to real life, as well: before posting/saying something, think about whether it benefits the audience to read/hear it. It really makes you introspect about the energy you're putting out into the world. It also makes it almost second nature to realize whether someone else is on the whole adding to or subtracting from your life. I've met so many people who I'm convinced would never speak if they weren't constantly seeking others' validation or trying to gain something material for themselves, and it's scary to think about how much worse off I'd be if I'd gotten close to them.