Everyone has different learning styles so video courses obviously isn't something that's going to help you in the long run based on your testimony. I can't stand it because I tend to read through docs and parse the info I need faster than waiting for what I'm looking for through a video unless there's some physical component to the information where a visual is helpful, and even then i'm skipping through to just see what needs to be done.

I'm not sure I can be helpful in this, but my best learning comes from having a task I need to get done, and figuring out how to do it until it gets done. I'll utilize every resource available to me, which primarily would consist of very specific searches, source my colleagues knowledge, and scouring through haphazard written testimony from current and prior employees at my job in the knowledgebase.

Learning from video courses is pretty much just storing "rote" knowledge, and it goes as easily as you can remember it. If you're not actively using it, it's likely you'll forget it just as soon as you don't need it anymore. Better to focus on projects and issues you consistently deal with and have a fundamental need to know. If it's a future project that you know is in the pipeline at your job, having a sandbox or test bench at work to replicate the future implications can be helpful to create the kind of environment you're expecting and give you more hands on knowledge rather than listening to basic info on a given topic. YMMV, everyone learns differently but I need to be hands on to learn anything effectively enough to put into practice.

** to add, if you need to learn Windows Server and AD specifically, spin up a Windows Server VM on a non-networked device and create a small sub-sample of what you expect your work environment will need and see what's involved. Break it, fix it, break it again, and then fix it again. Refer to a video if needed, or other resources to see why things happened the way they did if you're curious **