In a highly-competitive digital landscape, you have to stay on top of these things in order to rank well in Google, Bing, and Yahoo. I have an e-commerce store in a competitive market, so I need to pay attention to all of these things to ensure my pages rank as well as possible in SERPs. I'm no master at all of these things, but I'm learning!
1. Page speed.
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In short, the slower your page loads the greater the likelihood it will not rank well in SERPs. Optimize images, remove unnecessary code and scripts, and always use a CDN.