Hi ,trying to understand this concept

so I can add it to my rhythm and melodies

Trying learn Harmonic buliding tension Chords in Key Of C

first with just two intervals just Ascending in pitch and descending in pitch back to the tonic

and sound and make Harmonially sense

example let say

be like C all the way up to C 13 and back to C home

just using two intervals that give each 2 note chord it special Quality

can anyone help ?