I believe the lecturer is capable as a teacher and can (emphasis on the can) help you with understanding the materials. HOWEVER, I would not recommend taking his courses during this specific period. We are at week 7 (all online) and we missed 7 lectures (basically he skips on 1/3 of the lectures). 1 due to a holiday, 1 because he had an interview, 2-3 because of slow wifi or technical problems and 2-3 because of soar throat. He only made a recording for the lost lectures I believe 2 times and almost all cancellations came with a 1-2 hour notice before the lecture. For the 7 weeks of instruction, he only gave out 2 homework and 1 midterm which was delayed 3 weeks. Also, the only notes he gives is what is written on zoom and are not premade or tidy as you would see in other math courses. My understanding is that although he seems like a good lecturer, maybe he is in a transition career-wise so it's a bad time for him to give the attention needed to teach a course.