I would say:
- Learn docker. This is the base deployment tool for Cloudron. No need to learn compose/swarm etc.
- Take some time to learn Heroku. Also see 12 factor app. A lot of ideas for Cloudron app deployment are inspired from these two PaaS concepts. Heroku can deploy lots of different frameworks/stacks, so just pick one you are comfortable with.
- And then the tutorial link above should be easy to follow. Without knowing 1 & 2, the tutorial can be hard to understand.
Finally, there is lots of code at https://git.cloudron.io/box (looks for