For a long time I worked in one of the biggest and most highly respected SEO agencies in the world. I was very very good at it, without sounding like a dick hopefully I want to convey that I do know what I am talking about. The biggest problem you are going to face is ultimately so many different people out there are going to give you conflicting advice and most of it is just plain horrible.

There is a single book that I would recommend on the topic as pretty much the gold standard, if you read and absorbed absolutely nothing else on the topic besides it I would confidently put you in the top 20% of experts globally on the topic.

Spend the $40 get this book https://www.amazon.com/Art-SEO-Mastering-Search-Optimization... and be done with it. The entire topic is much less complicated than it is made out to be and if you have decent technical chops then you are already at a huge advantage over others.

There are some decent resources in here and there are some horrible ones. In my experience HN has never been a great resource for this kind of stuff.

I worked as a consultant for many years managing SEO for a number of fortune 500 style companies at a very high and detailed level. I lived and breathed nothing but this for years.

Practically the only book I have come across so far to date which I would feel comfortable recommending to anyone is this: http://www.amazon.com/The-Art-SEO-Theory-Practice/dp/1449304... however for the record they are releasing a new version of this book at the end of this month which you can pre-order here: http://www.amazon.com/The-Art-SEO-Mastering-Optimization/dp/...