Agreed about the meta keywords. I suggest reading up on w3.schema.org (drives Google-oriented SEO a lot), Opengraph (Facebook et al) and Twitter cards.
For example, if you FB Messenger someone your site, you will see that FB picks up logo, title, description and site URL from the relevant og: metatags.
I wish I could uninstall the SEO plug-in, unfortunately it is added in as an dependency by another plug-in.
IMHO it gives insufficient control and definitely insufficient detail. We generate w3.schema.org tags right down to the individual product level, our eStore pages are all static at the moment.
Every page has the Google / FB / Twitter / page Title / favicon set up right from the template (which is where you want to spend some time).
The template loads as an include from a source file, and then Jekyll loads the necessary data from the template and page front matter into the relevant SEO meta tags in the head.
I learned this the hard way, I am setting up a customer-facing company website which includes an eStore, and eventually had to do some research, as the SEO results were NOT what I was expecting…
For a very realistic, hard headed look at the subject, The Truth About SEO: How to Survive Online in a World of Robots, Demons, Influencers, and Spiders by Chris Lynch and Josh Llewellyn-Jones is fairly concise, covers more than you really need to know about the subject, and cuts through the marketing / SEO babble heard from so many so-called SEO experts.