I'm a Linux developer, where do I start with Octopus Deploy?

The first step would be to get a grasp of the fundamentals of Octopus:

Next, take a deeper dive into configuring your deployment targets:

Look at the type of deployments you’d like to do:

If you want to script tasks or interact with Octopus from the terminal, you can call the REST API and CLI:

You can use our Octopus Server Linux container to spin up a free local instance for testing during development.

Finally, as an aside, it may interest you to know that we run Octopus Cloud on Linux; this article explains the reasons we selected to run a Linux container in Kubernetes.