I learned about airgapped wallets

[apogio]

Make one of these backups out of metal, such as steel backup, because with all the geopolitical variables, fires, floods, disturbances, earthquakes, or wars may occur, and therefore it is better to keep one of the options from steel backup, as paper will not help you in such things.

Well, the reason I don't suggest metal is:

1. Too much hassle and more expensive.
2. The possibility of 2 out of 4 backups being destroyed at the same time is extremely low.
3. In case of fire or flood, I prefer my backup to be totally destroyed, rather than not. If it survives, who know who will capture it.

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[virasog]

For example, what is an "offline computer "? It is a computer that was never and will never connect to the internet. It is theoretically beautiful,  but practically it is not so simple and one little mistake is fatal.

How will you transfer the signed transaction? Pen drive? What if it is infected?

Well, you are right to the extent that the pen drive may contain viruses but then we are connecting Pen drive to the air gapped computer where the interent will never touch that device. So now, let suppose, a malware comes in the air gapped device through usb drive, but that malware cannot transfer data out to the internet because that device does not have access to the Internet.

just buy a hardware wallet. This is way safer for 99% of the people.

Still it depends as many people may buy it from offline and online stores and not from the official store and sometimes it has issues with tempered firmware etc if bought from third party.
Open source hardware wallet like Trezor is good alternative but i think using an air gapped device on a Tails OS is much better than using a Ledger hardware wallet which is closed source. (You need to be a bit technical in order to create an air gapped tails OS USB).