No matter how you like to participate in developer communities, Pulumi wants to meet you there. If you want to meet other Pulumi users to share use-cases and best practices, contribute code or documentation, see us at an event, or just tell a story about something cool you did with Pulumi, you are part of our community.

Pulumi Community

So there's a few resources for this:
Firstly our main docs on Inputs and Outputs, <https://www.pulumi.com/docs/intro/concepts/inputs-outputs/>
But also me and <@UCWG26BH7> have both wrote blogs about apply, Lee's is targeted at just about anyone, <https://leebriggs.co.uk/blog/2021/05/09/pulumi-apply>. While mine is if you've got an functional programming background, <https://blog.ibasa.uk/programming/pulumi/2021/05/20/pulumi-apply-monad.html>