Poems and idioms about "making friends" include:

1. The friendship between gentlemen is as light as water.

Source: "Zhuangzi·Mountain Trees"

Author: Zhuangzi

Explanation: It refers to the friendship between gentlemen based on morality, which is elegant and pure, as light as water.

2. It is a joy to have friends come from far away.

Source: "The Analects of Confucius·Xue Er"

Author: Confucius

Explanation: It is a pleasure to meet old friends.

3. Friendship between Jinlan and Lanzhou

Explanation: It refers to friends who have a close friendship, like brothers.

4. Bamboo-horse acquaintance

Explanation: refers to childhood acquaintance.

5. Friendship between gentlemen

Explanation: It refers to a friend who looks very ordinary but is actually very moral.

6. Heartfelt acquaintance

Explanation: Refers to a friend who talks about everything and confides in one's heart.

7. Friendships between cars and hats

Explanation: Refers to friends who do not make friends based on their status.

8. Friendly acquaintance

Explanation: Refers to friends who are committed to each other and do not follow their whereabouts.