Questions regarding wallets like (ledger, Trezor) and being anon

So from what I understood from reading different chats, these are some things I could use clarification on cause I'm very interested in learning more about this and all the anon stuff u can do.

1. I should always be doing something like revoke. cash after using a meta mask or uni swap for a transaction.

2 Shouldn't be using my main computer should have one only for access to the wallet.

1. Also, I saw something about sending transactions not while online and then processing them later somewhere else. seems wild to me but I'm interested in it. (don't broadcast)

2. Don't send all coins to one wallet. this one confuses me don't see how sending any coin to a wallet can affect anything.

3. kinda going back to the last someone said don't use wifi buy a mobile router. the fuck lol who is tryna get our stuff an army thought this was secure already lol

Does anyone have anything else to add or can clarify all those points in regards to security in this and staying anon thank you!