Here are the top rules and best practices to secure your funds in a hardware wallet. The biggest risks are moisture, fire and losing the seed/passphrase yourself:
Follow the following standard from Andreas Antonopoulos:
- Don't secure the seed or passphrase digitally - use a paper or metal.
- Don't split your seed in 2 pieces or more!
- Secure e.g. 2 copies of the seed in different geographical locations
- Do the same for your passphrase which should be 6-8 unrelated normal words.
- Laminate all of them (against moisture) and put them into secured fireproof safes for example plus envelopes from you know whether someone opened.
- Don't tell anybody except family that needs to know in case your e.g. die, are in a coma etc. Make sure they can only get to them in such in stances not in general.
Disclaimer: This is no financialadvice nor 100% bulletproof method, but rather the most secure approach with regards to practicalityaccording to current standards