Capitalization of blog post titles is not mandatory, but many bloggers and publishers prefer to do so. There are a few reasons for this. First, it makes the titles more visible on search engine results pages.
Second, it makes the titles more likely to be remembered by readers. Third, it can help readers to identify the article as coming from a specific source.
However, there are some cases where capitalizing the titles may not be appropriate. For example, if the title is a sentence that serves as a summary of the article, it does not need to be capitalized.
Additionally, if an article includes multiple titles that all represent different sections or subsections of the same topic, then all of those titles should be capitalized.