If you create your blog with Wix, you'll get access to our inbuilt SEO setup tools which will allow you do kickstart your SEO with crucial on-page optimizations, such as meta titles and descriptions. You'll also be able to sync your site with Google Search Console for important SEO insights. In general SEO is not something that is added to your site, it's something that should be integrated from the very start of how you choose and write topics, to ho well you optimize them to be found on search engines.