Use Electrum wallet and create a watching-only wallet on your desktop https://bitcoinelectrum.com/creating-a-watch-only-wallet/. That will let you give people your bitcoin addresses without risk of malware stealing your private keys or seed phrases, i.e. your bitcoins. Watching only wallet does not contain the actual bitcoins (the private keys), only the addresses.

Then get a computer that doesn't have any internet connection and create a cold storage wallet with Electrum. Since it has no internet access it can keep the private keys (your bitcoins) there. https://electrum.readthedocs.io/en/latest/coldstorage.html

And get electrum from https://www.electrum.org