I've been tinkering with Tekton this past few weeks, and have found a bunch of useful resources including: -
Tekton is an open source project to configure and run continuous integration (CI) and continuous delivery (CD) pipelines within a Kubernetes cluster. In this tutorial, I walk you through basic concepts used by Tekton Pipelines. Then, you get a chance to create a pipeline to build and deploy to a container registry. You also learn how to run the pipeline, check its status, and troubleshoot issues. But before you get started, you must set up a Kubernetes environment with Tekton installed.
I've also been following a pair of Tekton tutorials: -
and, of course, the official Installing Tekton Pipelines