Hi, Robin! Thanks for reaching out and apologies if the message was unclear. While the edits we are making won't be major ones to the content itself (topics, learning objectives, etc.), we still like to let people know that they are coming so that they can plan. So - here's an explanation - in our learning management system, course progress can be set to either "Complete" (you completed 100% of it), "In Progress" (you're working on it) or "Not Started". If you have completed a course (100% is done), then when we make updates to that course, your progress will remain as "Complete". If however you are "In Progress" - half-way through the course, 1/3 of the way through, etc., progress will be reset on the training materials that are In Progress.
Say that you are taking Data Engineering with Databricks and left off on video 4. Well, after we make updates, the system will no longer remember that you left off on Video 4. That's what we mean that you will lose progress on those course materials. Please let me know if you have any questions.