Mine: Do your own research.
Do not put all eggs in one basket!
The crypto world is more dangerous than it looks. Keep yourself safe!
Don’t invest more than you can take
Research. Research. Research.
Free airdrops without any work doesn’t always mean the project is good!
Set price targets before a run starts and take profits.
Stay in control, use your head to know when it’s useful to feel greedy and when it’s dangerous to ignore fear.
Mine: HODL TOMO
All good advice here. I would add that watch out for ICOs/IEOs and new hardware devices like wallets/nodes/miners that are unproven.
It might be scary when the price of your investment goes down 10 or even 20 percent in one day. Try to stay cool. Crypto is more volatile than most other assets, so if you made an investment in a solid asset you believe creates real value, it will most likely go up more in the long run than it went down. Zoom out the price chart to daily or weekly candles and look at long terms trends instead of 5 min or hourly candles. It will help you stay cool.