What is SEO strategies for E-commerce webiste?

As the title described. I have a plan to run a business website or a small ecommerce website. On that I have many categories with hundreds of products on each. And each product or category I have many brand belong to them. So I wonder what are the best methods to push SEO for this website.
Do I do SEO for categories or each product/product lines or do SEO for brand?

I see many things need to be clarified and need help from you all. Any advice will very helpful for me.

Thanks in advance

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