I like the Ledger Nano S hardware wallet. It's about $135 on amazon, make sure wherever you get it (even amazon) that it is a trusted seller.
Just be really careful, follow the instructions, and learn how to use the device with very small amounts of crypto, learn how to recover your main wallet and hidden wallet if you use that feature. There are all sorts of tutorials and youtube and such. Once you feel really comfortable using it and restoring it and moving crypto around, then you can start putting larger amounts on there.
Your 24 word passphrase is crucial, you cannot lose that or you are completely screwed unless you have a working wallet and pin and can get the funds off. It should not be on a computer unless it is encrypted and really secure, and even then kinda dangerous. You can keep it in a fireproof safe or a safety deposit box or something, you can get kinda creative but be smart. I.e. you could stamp it into a steel plate, put it in a ziplock and bury it on your property or in the wilderness and just write down the GPS coordinates. If you can have a secure backup copy somewhere else, that's good too.