Then you're (unfortunately) not quite the target audience. Broadly speaking my library lets you secure communications and authenticate stuff. It does not however provides a turnkey solution for most of that. It has signatures, but no certificates. It has key exchange, but no protocol handshake. Thus as it is, it requires some familiarity with cryptography.

At your (apparent) level of understanding, you're probably better off reaching for a higher-level alternative, possibly even full applications like Age (that let you encrypts files), or Signify (that let you sign files).

It says what it does in the first sentence on the page.

> Monocypher is an easy-to-use crypto library.