Major and minor chords.
A tonic triad can be formed by the interval 1,3,5 of its scale.
Example.
For C major chord, you have to take C major scale and its 1,3,5 interval which are C E G. Like this, just take any scale and its 1,3,5 interval to find out the tonic triad(major or minor chord).
We are not discussing the interval here.
ALL WHITE NOTE MAJOR CHORD
C MAJOR CHORD C E G
G MAJOR CHORD G B D
D MAJOR CHORD D F# A
A MAJOR CHORD A C# E
E MAJOR CHORD E G# B
B MAJOR CHORD B D# F#
ALL WHITE NOTE MINOR CHORD
C MINOR CHORD C Eb G
G MINOR CHORD G Bb D
D MINOR CHORD D F A
A MINOR CHORD A C E
E MINOR CHORD E G B
B MINOR CHORD B D F#