I am trying to switch careers, from legal secretarial to marketing. This is a credential that you can earn if you watch a series of videos and take a test. The certification is good for one year. Inbound marketing is a model where the customer come to you, because you offer good content on your website, and you learn about each other and build a reputation of trust that makes them want to look at what you offer, rather than the old cold-call method where you try to convince people to buy from you.