If your a beginner dont detune your edges on the side that contact the snow (called effective edges, google it if you dont understand what I mean). However some boards sharpen all edges, including those on the nose and tail. First, checkif your board has sharpened edges on the nose/tail. If it doesnt, then you dont need to worry about detuning.
If it does, you'll want to detune these with a stone because they can catch and that will cause you to fall. just detune the edges around the top of the nose and tail.
Heres a pic to help you better understand effective edge, nose/tail widths, etc.