It’s important to note that there are two parts to an NFT; the blockchain-based token and the digital file or thing it represents ownership of. Holders should ensure both parts are securely stored.
If the NFT is left in an unsecure crypto wallet, a hacker may be able to access it and steal the token from you. Without the token, you cannot prove ownership over the item it's associated with.
Similarly, if the file your NFT points to is not properly stored using a suitable data storage solution like IPFS, it may end up disappearing from the internet. This would ultimately leave you with an NFT token that points to nothing, rendering it worthless.
Check out our article How to keep NFTs safe for more information.