How can I add a new category to the left side of my online store?

[Gustass]

Hi guys!

I need your help, how to add a new category on the left side any idea?

Trying to do something like Aliexpress.

Everything helps, thanks!

I am creating a general store and need your help! 

How do I add category's on the left side(added 2 photos's what I am looking for)

Give me any tips, video's big thanks!