We’ve recently made several improvements to make it easier for first-time contributors to set up a local installation of Pressbooks using Lando/Docker. Please see the instructions in this repo: GitHub - pressbooks/local-dev-environment: This repository uses Lando/Docker to provision a local instance of Pressbooks for testing and development by open source contributors.
We also maintain several developer guides to help developers and first-time contributors get up to speed more quickly: Developer Guides - Pressbooks
To understand how ‘Book Themes’ work for Pressbooks, please see Book Themes, Part 1: Frames and Pictures - Pressbooks and Book Themes, Part 2: What’s Buckram? - Pressbooks
Feature requests and pull requests happen in GitHub: Pressbooks · GitHub. If you have questions about contributing code to Pressbooks, please don’t hesitate to ask here in the forum!