The AT Pro has got to be one of the easiest machines to learn.
It truly is a take it out of the box machine and go.
Across the top of the display pad it even tells you what signal numbers to look for.
As suggested, check out all the YouTube videos.........or at the very least go to the Garrett site and watch theirs.
After that if you have any question pop back in, there are loads of us that can help.