Microsoft Teams is a great tool which has a rising curve of adoption along many companies. But it has a lot of features and therefore it might be helpful to train your endusers and administrators. The web is full of Microsoft Teams Training offerings and lots of them are for free. Look at these Ressources
Enduser Teams Trainings
Here are some from Microsoft – Microsoft Teams Videotrainings.
Admin Teams Trainings
These are Teams Trainings ressources for admins.
Dear admins keep governance and security in mind and do not forget to take an extra eye on external sharing options in Azure AD, Teams, Groups, OneDrive and SharePoint! These are also topics in Microsoft Trainings which should get enough attention.