This is true. And this is exactly what I do. It’s important to note that you cannot become an actual (what I would consider an) expert in two months. But in that time you can learn more about a topic and be more competent at it than 99.9999% of regular people, and about 65% of so-called credentialed experts. Depending, of course, on the topic.

All it takes is 4-10 hours a day for a couple of months, depending on how much horsepower you have up there in the noggin.