Going through your 1st Crypto Bull Run. Here are some tips :-
1. When somebody says buy now whales are about to enter he's probably stuck in a trade and wants you to get stuck as well
2. Never buy a newly listed coin. Wait a couple days to get a clear picture
3. Never buy a coin that has already done 10% that day. It may probably run out of steam and go south again.
4. Don't buy a coin that has fallen by more than 10%. Search that coin, probably it has been delisted or hacked and prices are about to crash to zero e.g Luna crash.
5. Don't invest more than 50% of your capital. Market may go either way depriving you of a golden opportunity to invest at the right time.
Most importantly DYOR. Stay safe and may you make tons of money.