WordPress started as a blogging platform and now most websites are built using it. Latest estimates place it as being used on approx 42% of all websites. Read more here. From a blogging platform, the reasons for its success as the leading website building platform today might be a mystery to some. That’s a bigger topic.
Blogging in WordPress is so easy you may be doing it already with no instructions. Things are slightly easier if you are using the WordPress and the DIVI theme and a plugin installed on your site by Sundial. Please refer to this document for detailed instructions. It’s very similar using any theme.