When I was solving an algorithm problem and came across a problem I didn't know, I looked up related videos right away. This time, I paid the fee and completed the course from start to finish, which took about 40 days. The best part was that when applying the algorithm, it was good that it told me which problems the algorithm was applied to, and the code was not complicated and clean, which was good. Also, if I had a question about something I didn't know, I would be grateful if you would reply right away. If you film another lecture on JS in the future, I would like to listen to it again. Control ~ F. Oh! keeps coming to my mind.