Zoomtext is a screen magnifier for Microsoft Windows - available for PCs and Macs - developed by Ai Squared. ZoomText is available in two editions: ZoomText Magnifier and ZoomText Magnifier/Reader, which includes a built-in screen reader.
The videos below were created with ZoomText 11 which was released in 2017.
This 33 minute video will walk you through features in ZoomText 11 and some of the new hotkey commands.
Barrier Break's article, How Can Low Vision Users Browse the Web Using ZoomText? provides detailed written information about the various ZoomText settings options and basic hotkeys (commands).