What is the fastest way to recognize intervals?
Since we identify intervals by counting from the bottom note, it makes more sense to read the intervals (or chords) from the bottom note. For example, if you have this interval, look at the bottom note, which is E, and the interval, which is a fourth. So you would play E with the note up a fourth, which is A.
Should I learn intervals on guitar?
Five reasons for a guitarist to learn intervals
Your sense of relative pitch is what lets you identify notes you hear by ear. ... When you're just starting out though, intervals are a great choice because they are the most basic “building blocks” for developing your sense of relative pitch.