4. Do not be carried away with signup and referral bonuses, there are some people who are always thrilled with that in fact they hunt for that and sometimes they go meet the wrong site where they site would asked them to deposit some specific amount. Please newbie be warned do not be desperate to own some units of useless tokens whereby risking yourself.
You know the problem with this sign ups and referrals is that most of the paying airdrops this days are retroactive airdrops and most of this referrals and having to use gas fees to engage for daily activities are the Reason why people still believe in this things. Take for example this year most of the airdrops that have rewarded there users are the retroactive ones and this keeps pushing newbies into engaging in them. My advice is always similar to yours; always use a burner wallet and disconnect your wallet from DApps after every engagement.
As for seed phrase we should prioritize the use of passphrase because it is a second layer to the initial seed phrase and back them up separately offline. Use wallets that can allow you to have multiple addresses and prioritize the use of different addresses for different transactions because it helps against address poisoning sometimes