I have the same problem. I improved upon it by writing recall notes in a word processor - with diagrams, code, explanations - every 3 or 4 weeks. I do this for

I have the same problem. I improved upon it by writing recall notes in a word processor - with diagrams, code, explanations - every 3 or 4 weeks. I do this for every topic I'm having difficulty with. It has improved my recall and understanding. I did try Anki for a while, but I was unable to get comfortable with its user interface or workflow. This is possibly because the topics I'm learning are concept and math heavy like ML and image processing, and unlike spoken languages, don't lend themselves easily to rote memorization.