1, you need to specify the object of comments, such as an article, a news event, a social phenomenon and so on.

2. In the comments, you should clearly express your views. This view should be a general view of the object of comment, not just a description of some details.

In order to support your point of view, you need to give sufficient reasons or arguments. Reasons or arguments can be facts, data, theories, etc. But you need to make sure that they are relevant and convincing.

4. At the end of the comment, summarize the whole comment, emphasize your own views and reasons, and point out possible next actions or improvement measures.