I took Java classes at the academy for 4 weeks (32 hours) (Saturday and Sunday). At first, I listened at a regular speed, but after the middle, I listened at twice the speed, and it went straight into my ears. The part where you explain with a pencil when entering each chapter was very helpful for understanding the concepts. The part where you write program code was explained one by one, so it was easy to follow. And as you progress, the code was explained gradually by linking it to the previous code, so it was better than any other lecture for solidifying the basics of Java. In my case, the following order was easy for me to learn. Basic explanation -> Several code examples -> Problem solving I think the teacher's lectures are very good because they are given in a similar order as above.