friend of mine uses Yoast SEO for his wordpress sites, I have checked it out its a pretty useful plugin. Unfortunately I dont want to pay for a plugin for wordpress anymore so I have found other plugins to try to do what Yoast does.
next 301 redirects https://thefoxe.com/products/404-to-301
next images alt tags
facebook, opengraph twitter, google+ etc http://www.webdados.pt/produtos-e-servicos/internet/desenvolvimento-wordpress/facebook-open-graph-meta-tags-wordpress/
how about the famous backlinks