What proverbs, idioms, fables and so on. Explain the position and role of the principal contradiction and the secondary contradiction, and the principal and secondary aspects of contradiction in the development of things? Back to the end: in ancient times, agriculture was often the foundation, and handicrafts and businessmen were the destination. Refers to deviating from the main part and pursuing subtle details.

Indiscriminate: refers to people who can't distinguish between primary and secondary.

Car insurance, if you lose your piece: originally a chess term. The latter metaphor throws away the secondary and keeps the main.

Priority: refers to all kinds of things that are clearly defined, urgent and can be done slowly.

Catch the thief and catch the king first: it means to catch the main enemy first in battle. Grasping the key first is also a metaphor.

Putting the cart before the horse: this is the root of the tree; End: treetops; Setting: put. Metaphor reverses the position of primary and secondary, light and heavy.

Noisy: loud: loud. The guest's voice drowned out the host's. Metaphor foreign or secondary things occupy the position of the original or main things.

There are many related things.