Open source, Non-custodial wallet and trusted wallet that already a year of existing is enough for to me to called a safe wallet.
Secondly, we should choose a recovery-friendly wallet, meaning if anyone loses access to the wallet, there should be an easy recovery option.
This might be useless if your crypto already transferred to another wallet.
From the start of choosing wallet, you should know that it will never be hacked to anyone else. Put in mine always the golden rule of crypto "
Not your keys, not your coin". Another thing is running your own Bitcoin node by user Tor network might increase your security.
Thirdly, we need to choose a wallet that supports our preferred coin.
Bitcoin wallet that support only for Bitcoin, Altcoins wallet is for only altcoins, don't mix them up.