I would like to nominate @princewahaj once again for his helpful and HQ post :

https://steemit.com/steemit/@princewahaj/understanding-the-leading-seo-metrics-domain-authority-and-page-authority-the-real-gem-of-seo-which-can-determine-your-success

In his tutorial series, he is teaching us some great methods to rank on 1st page of Google. He is SEO expert and I've not seen many people sharing such knowledge. Worth to nominate.