acoustic guitar - Version 1.0 http://www.guitar-acoustic.us - Before you start, one important rule is to first identify which is the string that being called or named "1st. String" in guitar term. The 1st. string is referring to the smallest string located at the lowest position of the guitar's neck. Once you knew which the 1st string is, identifying the 2nd, 3rd, 4th, 5th and 6th string will be very easy. The 2nd string is the string located above the 1st string. Same arrangement applies to the 3rd to 6th string.