ecommerce, im guessing?
Nothing different about seo on shopify, however ecom is different then blogging for seo. Offpage seo (backlinks) is more important for ecom since keyword ranking is a bit tougher on page with ecom due to restrictions on overloading the page with text and creating an unpleasant experience. If you can code and/or utilize text to code programs you might be able to beat your competition with some fancy custom scripts. You will want strong on page depending on your niche.
Depending on what you sell and how many category pages you'll have will depend on how you want to backlink to your inner pages. You will mostly want a specific url per category you are trying to rank. I also check competitors on serps to see how they are using their urls for the categories. If you're a one page store then good luck you wont rank for much out side of maybe a handful of keywords. I would suggest buying some apps on shopify for seo and marketing (maybe a month or 2 after you have your website designed really well). You can get most solid apps for under $10 per month, or you can start with free ones which usually work just as good with less features and tend to slow down your website speed more. If youre serious and have low coding skills, it would probably be worth to invest $200-$300 in a theme you like, it will provide a ton of extra features in the design editor that can go a long way.
Overall, it really depends on how deep your going to get with it. 1-10 pages is going to be very much different than 100-1000s+ pages when it comes to seo. In short backlinks are your primary source to rank for ecom, the larger amount of pages you have will increase the importance of on page seo. Having a blog section is always a good idea but due to the basic layouts typically on shopify it will likely underperform your competitors without some custom coding and strong on page to match.
