Do not invest more than you can afford to lose: Cryptocurrencies are volatile; only risk capital that you do not need.
Do not ignore research: Do not buy a crypto just because of hype. Study its technology, team, and use case.
Do not keep everything in one exchange: Exchanges can be hacked. Use reliable cold or hot wallets.
Do not share your private keys: Never give your keys or seed phrases to anyone; it's like giving access to your money.
Do not fall for promises of quick profits: 'Easy money' schemes are often scams. Be wary of help from strangers.
Do not trade with emotions: Fear or euphoria leads to impulsive decisions. Keep a cool head.
Do not forget security: Enable two-factor authentication (2FA) and use strong passwords.
Do not blindly follow influencers: Many promote projects for their own interest. Always verify the information.
Do not invest without diversifying: Do not put everything into a single crypto; spread the risk across several assets.
Do not ignore regulations: Know your country's laws regarding cryptocurrencies to avoid legal issues.
Let me know if you want to delve deeper into any of these 10 items.