Sharing content on your screen will help your attendees stay engaged and up to date with the conversation. MS Teams allows you to share specific windows (eg a word document) or your whole desktop. If you are sharing your desktop, ensure you've any sensitive documents closed as users will see everything you're doing.
To share your screen, simply hover over the call screen and click "Share" then select either desktop or the window you wish to share. Please note your application has to be open and not minimised to appear as an option to share as a specific window