Learn the basics of Microsoft Teams
If you want to quickly learn all the basics of how to use Microsoft Teams we strongly recommend the Microsoft Teams Demo website.
You can get to it with this link.
It runs through all the basics and gives you a quick tour of Microsoft Teams in about 5 minutes. It is interactive and will work on your phone or computer. Keep in mind the training provided is generic in natures and your business may not make sure of certain team features in the same way.
There is also a really good reference/quick start guide that can be found here.