The personas material are some example of different personas that will help you to create your own personas for your organisation. During your adoption project you should have 3-6 personas (depending on type of organisation). A persona is a high level definition of a role in your organisation and how they work, so you know how to target them for education of Teams.
Example if you have an department working with economy in your organisation, they might now schedule any meetings (then you don't have to focus on that), the share files within their team (focus on educating them on working with files) and they also send out information to other persons (educate them how to work with that).
Another persona might be the warehouse worker that only will use Teams in their mobile phone (no need to educate them on the desktop client), they are going to use Shifts everyday (focus on that).
So with creating personas for your organisation you will make sure that users get the help they need to get started with Teams. Personas is just high level so you will always find exceptions and people that change roles now and then.
