Before looking over this lesson you should have a good knowledge of intervals and modes, if you are not sure of this I would go over lessons; #1447: Intervals, Mystery Of The Modes - Part One (#1567), Mystery Of The Modes - Part Two (#1583).
This lesson is designed to help beginners get the most out of a scale. All the ideas I present here can be applied to the any of the minor keys, I am using the Major key to illustrate my point.
There are two types of Scale forms that you will run across while learning the guitar. One type is easier for your left hand to manage while others will be easy for you right hand.
Scales that are easier for your left hand have no more then three notes per sting and no less then two notes per string. Also they generally exclude the use of two consecutive Steps, look at example a.
Below is an example of scales (In the Key of G) that I consider easier for the left hand.