Best practice SEO Tips needed

Hi,
I have 2 Ecommerce websites built on WooCommerce.

I never really consciously put efforts into SEO until now.
1 of my sites is fairly new and the other has been receiving good traction for almost 1 year with over 600 visitors a day and around 20 orders average.

I am looking to improve this.
Ive installed Yoast SEO WooCommerce on both my sites.
But what am I supposed to do exactly?
How do I begin to rank??
Ive seen YouTube videos and they seem to be technical (too technical) and don't really tell where to start.
Some talk about writing blogs. But how am I going to get traffic to my products with blogs
Some talk about backlinks, but how do I get backlinks from my country websites.

I am just lost. Looking for guidance