YouTube’s community guidelines prohibit nudity/sexual content, violent/graphic content, hateful content, spam, harmful/dangerous content, threats, and content that doesn’t respect copyright. For comments, the particularly relevant prohibitions are hateful comments, threatening comments, and spam. What is your purpose for commenting on the video? Did it inspire you? Did it make you laugh? Do you think the person who made the video missed something and could improve it? Are you hoping to start a discussion thread? Leaving mean or thoughtless comments is more likely to get you blocked than noticed, so think about your comments before posting them. As an example, maybe you watched a beginner's dance tutorial video on YouTube; maybe you’re a beginner, and even though the tutorial was aimed at people like you, you felt that it was still too difficult. You want to communicate to the teacher in the video that you found the dance routine difficult to learn. Before commenting on a video, skim through as many comments as you can to ensure that you’re not just repeating what someone else has already said. If you do find a comment that says what you want to say, consider liking (clicking on the “thumbs up” icon below the comment) and/or replying to it rather than posting a new comment altogether. If you don’t like a video, it’s okay to say so — just be respectful. If your first thought after watching a video is, “Well, that was terrible. What a waste of time!”, why waste more of your time in commenting on it? If you simply must comment, figure out why you hated the video, and offer some advice on how it might be made stronger.  Avoid comments like “Teaching style sucks! What a waste of time — learn how to teach!!!!” Try using comments like “Thank you for making this tutorial! I’m a beginner, and even though the tutorial is made for beginners, I really struggled with it. For me, I think it would have really helped to have the dance broken down into more sections, with a couple of run-throughs after each section. At the...

How would you rephrase that briefly using Vietnamese?
Làm quen với nguyên tắc cộng đồng của YouTube. Nghĩ xem tại sao bạn bình luận. Đọc bình luận của người khác để tránh trùng lặp. Tôn trọng người khác. Bổ sung điều gì đó vào đoạn bình luận. Tránh sử dụng chữ hoa.