Even when you understand something, reviewing information about what you know is helpful.
I am doing that by watching videos from John Savill. I mentioned earlier that he was an excellent teacher of Microsoft technologies. I am listening to him now because even though I may understand something, reviewing it gives me new insight and ideas about how it works. Research shows that you have to review something 5 times if you are average and 3 times if you are a genius to understand it. Therefore I don’t consider it a waste of time/energy to review the most important information that I am responsible for. See the evidence here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6050388/
Today I realized that because this isn’t the first time that I have heard that I don’t need to watch it at normal speed. I put it at 2x speed and if/when something he says is more complex I will pause it, slow it to normal, and back it up and listen. Then when I feel I understand it move it back to 2x speed. Your time is valuable and if you can learn something new by reviewing then great. Now with it at a faster speed, I have to focus more on it than I would at normal speed. This is far to save time.
One of the interesting things that I have learned when I review information is that no matter how well I think I may understand something, there is something important that I missed. Our understanding is always incomplete, but time and experience will fill in the blanks. It is a great feeling to be able to grow and learn. I don’t understand why more people aren’t more motivated to learn.