Practice memorizing notes on the first twelve frets of the guitar fretboard (with standard tuning). Press the spacebar to have the program randomly select a certain note at a specific string and fret. When you think you know which note was selected, press the spacebar again to be shown the correct note. Click on the blue dots next to the strings or the green dots above the frets to add/remove the frets/strings from the list that the program will select from. This feature allows you to focus on memorizing notes from a specific set of strings and/or frets rather than having to learn notes from every string and fret at once. Hope this helps!