One of my stats professors said she saw gaining statistics knowledge as a spiral that moves up slowly but the main point is going around and repeating concepts. You will revisit ideas again and again and you shouldn’t expect yourself to get many of them the first time. I think some people feel dumb when they don’t get it right away. In my case, I learned just enough stats to do well in each class, but I found that with each additional class I understood much more about very basic statistical concepts that we reviewed.