Revoke.cash - Is it safe?

I was reading about someone getting hacked and their wallet drained and other posters said they should use revoke.cash periodically to make sure "you haven't give token approvals that you have forgotten about." I know that is a real concern since if you don't revoke these approvals, the dapp can spend your tokens forever.

But.... I also am very careful not to connect my wallet to anything casually. When I go to revoke.cash I have to immediately connect my wallet. I don't have a Phd in Crypto, so I am reluctant to do it and that is why i am here.

Can someone explain to me IF it is safe, and why? I don't want to make a mistake while trying to prevent myself from making a mistake. Thanks