John B. answered 10/09/24
Music Theory Tutoring - Graduate Assistant, Former HS Choir Director
It has become a popular tradition for beginner musicians (particularly on strummed instruments like guitar, ukulele, etc.) to begin their journey by learning to play chords based on their lead sheet symbol (C, D, and so on). There’s a good reason for this. Chords are an extremely useful short-hand for expressing harmonic language, and if you learn them quickly by rote, you can start playing songs very quickly!
The world of chords, of course, goes deeper than that. The tradition of Western music began without the concept of the “chord” as we understand it today, but rather, through the use of consonant and dissonant intervals. It is fitting, then, to begin your study of chords with the study of intervals, their quality, whether they are consonant or dissonant, and their contrapuntal use cases. Only a student with a thorough understanding of intervals will have a fully informed understanding of chords, and from there, the student can dive into the function of chords (why certain chords are used in certain contexts).
By the time you’ve gotten to this point, you not only understand the use of chords, you understand harmony itself! So, to summarize, learning chords is important because, not only are they a useful tool for learning to perform a song quickly, they are the primary vehicle of modern harmony itself, and their study will lead directly to an understanding of harmony.