Try to solve the problems in the textbook by yourself.
This videos of the solutions are just references for you.
I do not record voice to explain or guide how to solve, because all of the explanations are already in the textbook and I would like not to bother your thinking.
Keep the textbook close to you, and keep trying to think by yourself.
If you find any alternatives, suggestions, and questions, let me know by leaving a message in the comment section.
Good luck and enjoy!