Hey guys I'm newbie here few bitcoincore or sparrow questions

New to bitcoin, Im a little confused with this new area and try to set the bitcoin as saving to protect my assets being devalue.

I learned from the bitcoin website that using Bitcoin Core to generate public and private key, the process is download official fies from web and copy to a new USB drive and put it in a new computer that completely offline, then run Core file in a offline operate system, (and avoid download the whole chain) and generate wallet key offline, after that, make a copy of wallet.dat, backup in 2 or 3 new usb drive and write my private key down.

If come to saving coins,heres my question:

1.After finish creating the wallet, do i have to physics destroy my new computer? If i keep my new computer offline all time would i be able to keep my computer?

2.Due to the bitcoin core, If i only remember the private key but lost my .dat file, what happened to my wallet then?

3.Is Sparrow wallet better or friendly? Cuz bitcoin core need to copy the new .dat file if you want a new receive Address

4.Come to long-term saving and safety what hardware wallet you prefer?

5.Bitaddress good or no good?

Again Thanks you guys and this lovely community, i been learning for days, no one around me know these things and I'm little bit lost.please enlighten me, thanks you



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