Reddit reviews Web Analytics: An Hour a Day

If you want to keep up to speed with the latest development I would recommend blogs like the official Google Analytics blog, Occam's Razor, The Daily Egg, The KiSSmetrics blog etc.

But if you want good tips on how to get started with GA I would recommend Web Analytics - An Hour A Day and Web Analytics 2.0. Both books are by Avinash Kaushik. They are old (for digital marketing litterature) but most of the messages are still very relevant and I found them a great inspiration to get started on structured analytics and how to incorporate analytics in your daily work in a digital marketing organization.

I think the GA courses put out by Google are pretty good.

https://analyticsacademy.withgoogle.com/

Optimize Smart has a bunch of really good shit as well.
https://www.optimizesmart.com/google-analytics-training-resources-and-tutorials/

I would also suggest reading Avinash's book as well. I know some people find him to be rather verbose. But i'm a big fan.
http://www.amazon.com/Web-Analytics-Hour-Avinash-Kaushik/dp/0470130652

If you look at the numbers, there's isn't one area of marketing that's absolutely dominant. (Check Econsultancy! for stats)

So the modern marketer will have a mix of all the different skills. For example in digital, you need to know search advertising, email marketing, wed design/development, social media, ecommerce, analytics and so on.

I'd start with measurement though; you can't practice/allocate budget until you can measure results. Read Kaushik's Web Analytics An Hour A Day.