I'll write down what I felt after taking 90% of the course. I'm planning to complete the course. First of all, the instructor is very good at explaining things. He explains even the details well. I don't think I have a good understanding, but I didn't have any difficulties while taking this course. Do you know what I mean? He explains things so well that it's easy to understand. I think that if you complete this course, you'll have all the basics of JavaScript. If you're lacking, you can search MDN or other materials or buy a JavaScript grammar book to supplement it. I also asked a lot of questions on YouTube, and he answered most of them in the comments. That's what I liked the most.