There are a few key elements to learning Marketo. Learn these and you'll be halfway to mastering Marketo.

Used with Smart Lists, these let you automate almost any flow of actions.
Defines a set of people in your database and listen for specific behaviors.
These are like folders. Almost everything you do will be inside a program. 
Helps marketing teams coordinate their activities inside a calendar view.
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Stuff we thought you should know.