Welcome...Getting a GPS CharterPlotter will not eliminate the need for keeping your paper chart handy, and an everpresent watchful eye all around.
I have a very basic GPS that has a decent (not great) map of Lake Winnipesaukee. I also downloaded the waypoint files from Bizer Maps, saving me hours of inputting those waypoints. It certainly helps to keep track of where I am on the lake, especially at night, but again, doesn't replace local knowledge and the use of a paper chart and the old eyeballs. Recommendations from those who have CharterPlotters seem to favor those units that can use CMap cartridges (actually little memory cards like you use in a digital camera), and the map of choice seems to be Bizer's map. At last glance on his (Bizer.com) website, Garmin GPS cannot or do not support Bizer maps.
I'm not aware of a "tutorial" website per se, but perhaps when you make a decision on what kind of unit you want, their website may have a tutorial.
Good Luck, and welcome to the forum.
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