On your edit tor area, there are 2 ways to create a blog

1. Go to "Content" -> Click "Plus Icon" -> select "New Post"

2. Go to "Site" -> Blog -> Click "Add"  

Fill your Post Name and select Categories

Blog Catagories

You can click Add Category to create your own category. Also, you can select the parent category with the 3 maximum levels. For example: If we add "Cats" category and select parent category to "Animals", a "Cats" category will be under the "Animals" folder.

Add Widget

On the Post page, there will be a blog widget which contains Category list and Recent Post as a default. 

You can add more widget by clicking the "Section" icon then selecting "Blog"

Category list: This widget shows all your categories

Recent Post: Shows your latest post also you can adjust the number of posts, set date & time, author name and categories.