There is no definitive answer to this question as the answer will depend on what type of blog you are creating, and what you hope to achieve with it. However, a few general tips can be offered.
If you are creating a personal blog – for yourself – then it is likely that you will want to focus on topics that are of interest to you, and that you feel passionate about. This could include topics related to your own life, interests, or hobbies.
If you are creating a blog aimed at promoting a particular product or service, then it may be more appropriate to focus on topics that are related to that product or service. For example, if you are writing a blog about makeup, then it may be appropriate to focus on reviews of different types of makeup products, tips for applying makeup correctly, and so on.
Finally, if you are creating a blog for a business or organization, then it may be more appropriate to focus on topics related to the business or organization itself. This might include articles about the history of the business, how it operates today, news about new developments within the company, and so on.