Who knows more about English grammar online video resources, not too detailed (that is, too much)? I have CET-4 and I want to review it.

You can try to learn grammar with a software called "I love learning grammar". There are various explanations, examples and exercises, and you can also check grammar points. The exercises are all in stages, primary school, junior high school, senior high school, university and so on. You can judge right or wrong when you do the questions, and you can explain them in detail. The wrong questions can be saved and reviewed later. It's the software of the Gladiator series. You can download it from their website and try it out. Taobao also has it.