With the free version of WordPress, you don’t really have that much freedom to make changes to your site. Plus, WordPress actually owns your site if you use the free version (meaning, your site is technically not even yours). With the free version of WordPress, your website link even looks unprofessional; instead of a .com ending, your site will look like “yourwebsite.wordpress.com”.
SEO – SEO stands for search engine optimization. Basically, you want search engines, like Google, to index and rank your content high in their algorithm, so that when people do an internet search — your content is easily found (preferably on page one). So when you research and write your content you'll want to consider your niche, keywords, questions, and phrases that individuals are searching for and intertwine these into your blog posts. This is an oversimplified definition, but it gives you the gist of what SEO can do your blog. This article talks more about SEO so you can start learning the ropes.
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.