Obviously, you can blog about almost anything. However, you won’t succeed at it if you’re not staying true to yourself. Don’t blog about something you’re not passionate about. Don’t blog about something you’re not knowledgable about. You have to have some degree of knowledge and a big degree of passion. That’s just how it works if you want to succeed.
Selling private ads can come in the form of banners, buttons, or links. You can even make money writing sponsored posts where you write about or give a review of an advertiser’s product or service. Another option is to write an underwritten post or series, which is where you can write about any topic, but the advertiser pays for a “Brought to you by” mention in the content.