100’s of Hacks For Better Google Organic SEO Ranking [E-Books]
I have been a huge proponent of infographics as an extremely effective method of learning for the past 6 years.
I have learned much about digital marketing from working, attending seminars, viewing video tutorials, reading digital marketing blogs daily, but I like compiling infographics (over 6,000 so far) as a handy reference or look up pertinent information at any time. I also have many Google AdWords Guides in PDF format. Check those out too.