What mistakes did you make, and what advice do you have for others to be careful?
What are the best and worst ways of storing a seed in your opinion?
I think most of the mistakes made by many Bitcoin holders who lose their wallets is not storing their seeds in a safe place and some don't back up their wallets. This is usually done by many early adopters of Bitcoin.
The reason I say this is because I lost Solana to such naive habits when they started SOL ICO. At that time, I earned about 200 SOL via airdrop, but never backed up my wallet.