Hi @jensj and welcome to our community!
I thought I’d turn this into its own topic so that it gets more eyes. 
@ball shared a lot of great resources - all in our OpenMRS Knowledge & Professional Development Center. As you might have noticed, the Implementation Track is still a WIP while our Development Track is more finished (though slated for updating for 2024).
We’ve had a squad or team come together periodically to work on our two mentorship programs (GSoC and Fellowship Program), our OpenMRS Fundamentals Academy (in-person & online). Right now, our Professional Development Management Team is working to organize, update/improve, and package our different professional development offerings as an OpenMRS Academy. They meet every other Tuesday & Monday - and you’re more than welcome to join one of their calls.
Reach out with any questions about our existing materials, where we’re going in 2024, or even suggestions!