There is no one-size-fits-all answer to this question, as the answer will depend on your relationship with the blog and the blog’s commenting policy. However, in general, it is generally safe to comment on blogs that are open to comments and that allow users to post their own comments.
Some bloggers may require that you first create an account before you can comment, while others may allow you to comment without an account. It is also important to remember that not all blogs allow anonymous commenting.
If you are unsure whether or not a blog allows comments, it is best to contact the blog owner beforehand.
Finally, it is important to be respectful when commenting on other people’s blogs. Do not spam the blog with unwanted comments, and make sure your comments are relevant and helpful.