The following links are using TypeScript. If you are not familiar with that, so I recommend you to check TypeScript first.
lyty.dev shared their page with me. The site looks good to me. If you are not familiar with TypeScript, lyty.dev is for you!
https://lyty.dev/deno/index.html
Also, deno.land is a good resource since you can check the published libraries' code easily. https://deno.land/std https://deno.land/x
https://dev.to/brunnerlivio/create-your-first-module-with-deno-575k
This article was very useful for me to publish a third party lib to deno.land.
This article explains how to create a simple CLI tool with Deno.
If you want to publish a lib and can read Go lang code, Go lang packages site is helpful since Deno doesn't have a system like npm which means all libraries will be checked by contributors/code owners. I saw a PR that someone tried to publish isOdd/isEven for Deno, then a reviewer just rejected the PR because they were just one line code, so they didn't need to be a lib.