The easy way to manage blog posts to display them on your website.
Go to Website -> Blog and then press Add Article to add a title, summary/preview and then the content itself.
You can keep it as a draft, publish it, or schedule to post in the future by choosing Published and a future date.
The blog is displayed on your website through the Blog module.
The blog module offers lots of customisation options to control how your blog is shown and how articles are listed.