Nothing to say other than posts can be used as a “blog”. It can be a useful diary for work or personal reference.
Once you are logged in to your dashboard, create a New Post, from the + in the dark grey bar across the top of the screen.
Choose a category or create new categories to the right of this text, then hit the blue “Publish” button to the right.
Currently visitors can’t see your blog posts, but to allow visitors to see your posts, once logged in, go to Appearance/Widgets and drag and drop blog widgets ie “Recent Posts”, “Categories”. Add them to the sidebar section.