Preliminary understanding of chords and chord decomposition exercises

In scales, C is the most stable tone, known as the tonic, and other tones are relatively unstable. The most supportive of the main tone is the upper fifth G and the lower F, which represent the subordinate function and the subordinate function respectively. They are called subordinate and subordinate. A has the closest relationship with the main tone, called the lower baritone, D has the closest relationship with the subordinate tone, called the upper main tone, E and B are called the middle tone and the leading tone respectively.
What is a chord? First look at the following picture:
A chord is composed of three or more sounds, superimposed according to the three-degree relationship.
The triad, 135, on the main tone, is called the “main chord” and is recorded as C.
The trichord formed on the tonic, or 246, is called the “tonic chord” and is recorded as Dm.
The trichord on the baritone, 357, is called the “neutral chord” and is recorded as Em.
The triad formed on the subordinate tone, 461, is called “subordinate chord” and is recorded as F.
The trichord, 572, is called “genus chord” and is recorded as G.
The triad, 613, formed on the lower baritone, is called the “lower middle chord” and is recorded as Am.
C, F, G root to three is big three degrees, three to five is small three degrees, collectively known as “big three chords”. Dm, Em, Am root to three tones is a minor third, three to five tones is a major third, collectively known as the “minor triad”.
Get such a table:
In C major, the main chord C, the subordinate chord F, and the subordinate chord G are called sine triads, which constitute the framework of harmony. The main chord has the strongest stability and is often used at the beginning and end of a song. The subordinate chord is also the most supportive to the main chord. The tendency from the subordinate chord to the main chord is the strongest, and often appears before the main chord. Subordinate chords can go to either the main chord or the subordinate chord, often appearing in the climax and chorus of songs. These are good chords. C G C; C F C; C F G C.