Make it your goal to teach a room full of other humans that topic. I guarantee you will know that material cold. I've done lots of technical training in my career and after teaching a class two or three times I find myself to be very competent in the topic.
It's long been the case that the best way to learn something is to teach something.
> It's long been the case that the best way to learn something is to teach something
Which is pretty unfortunate for those that want to learn. I used to enjoy writing documentation at work, it was my favorite part of the job. And it did feel like it benefited me more than it benefited all the people that were (or weren't) reading my documentation. Now I can't really justify spending much time on docmentation when LLM's can do it in a fraction of the time and it's "good enough"