1. Don't invest if you're afraid to lose what you've invested.
2. Don't expect for a high income if you invest a low amount.
3. Expect the worst probably losing all the value of the coin you're holding.
4. Don't believe on HODL, if you're losing a big amount cut your losses you don't know if that coin has a value in the future.
5. Divide your investments don't just invest on 1 coin.
6. Don't just invest on some coins, study them.
7. Read and watch different tutorials about trading and tips
8. Practice trading through simulator exchanges
9. If you want actual trading start with small investment first and if you're ready then start a serious investment
That's what I recommend for users to avoid losing a large amount since I saw a lot of investors invest to some coins and invest all their money just on one coin and when the price drops they're ranting and crying all over the forum.
for beginners this is certainly very helpful in helping their initial trade.