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Hi Alicia Those videos are basically used as an introduction on how to use the moz tools. Their basic SEO guide is one of the best out there which can be found here http://moz.com/beginners-guide-to-seo Neil Patel released his guide recently and it's a good way to get more information about doing SEO http://www.quicksprout.com/the-advanced-guide-to-seo/ Don't be afraid to ask here, we will try to help out as much as we can.

They're automatically chosen. If the keyword is ranking in the top 50 of your preferred search engine, the keyword is added. We have some more information at http://moz.com/help/pro/on-page-reports that should help.

Hi Alice, As the other posters have noted, the Help Hub and the Beginner's Guide to SEO are both excellent resources for learning the ropes. I'd keep an eye on the blog, too, as posts frequently deal with using Moz tools. You'll have it all down in no time. Matt