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Working with encryption more broadly will equip you to understand the fundamentals that underpin the web3/crypto world: hashes, asymmetric crypto, signatures, signature chains, etc. And it also has many uses, of course, outside the web3 realm.
If you're working with Node, tweetnacl.js (https://github.com/dchest/tweetnacl-js) gives you secure defaults and a nice API to start learning and building with.
Once you're familiar with this stuff, blockchains/cryptocurrency/web3 loses a lot of its mystery. They're essentially all just different takes on using key management and signature chains to verify identities and