I really enjoyed reading about Matthew Roche's history with certification exams. If you've got a few minutes, give it a gander!
CSG has a new DAX series on YouTube. If you're looking to learn DAX, you might want to give it a try.
Marc Lelijveld has created an external Power BI tool for documenting your model. This could be a great resource for source control and CI/CD efforts.
If you ever wanted to take your report drill-through to the next level, Patrick LeBlanc shows you how to do it!