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”.
Lets say, for example, that you refurbish and resell used smartphones out of your home. You could use a blog to attract visitors to your website where you list your current phones for sale. Your blog might cover topics about DIY refurbishing. On one level, it seems counterintuitive because you want people to buy your phones, but it also helps you build a brand and gain recognition. Social media guru Jay Baer explains the concept on Copyblogger: