You can create blog category from admin panel left menu Blog => Blog Categories here you can create as many as category to assign blog within.
Blog post can be created from admin panel from left menu => Blog => Blog Posts
Create blog post and assign to blog category.
Blog setting and blog comments also can be managed from admin panel from left menu Blog => Blog Settings and Blog => Blog Comments.
Blog link is usually available at the bottom footer of the website. or by this link:
Example: www.yourwebsite.com/index.php?route=blog/home
Add your valuable comments, so others can read.