Originally Posted by: pconover

In Fundamentals 2, Lisa spends some time on "open" major scales, especially D, E and A. I noticed (after having practiced these a while) that she tends to play them in what I would call "second" position, meaning index finger at the second fret, etc., whereas I had practiced them in "first" position, index finger at first fret, etc.

In general, you should use the idea of one finger per fret. However, in some scales if you don't need to use the first fret on any given scale or string, there's no reason to devote a finger to that fret. Even if there is an open string. If you can play the scale conveniently & cleanly with your index on the 2nd fret, then go for it.

The guiding principle of all motion should be to use the most efficient motion that helps & does not hinder playing the music cleanly & clearly.

You can always ask Lisa directly in her instructor forum!

https://www.guitartricks.com/forum/threads.php?f=46

Hope this helps! Keep practicing!