When your finished writing a post, you should assign it a category.
If this is a new categories for you, go to the right hand side of the screen where it says categories. Click add new category. If you already have categories you can make a new category as part of a old category by choosing parent category. (eg grammar could be a category inside writing.) In the box for categories type the name of your category. Now click the add new category box. Now you have the new category you want.
If you are typing a post that you want as a part of a category you already have , you just have to click the box with the name of that category and it will now be part of that category.
Categories appear as a label at the bottom of every post. If you click on that label all the posts that are in that category will appear. It will help people look at posts that are similar in your blog.
If you want to make a category without having made a post, go to your dashboard, on the left float over “post” and choose ‘categories’. On this new page, name your category and click the ‘add new category’ button at the bottom.