Please give me the poem "Encourage Learning", and then tell the general idea of the poem in your own words. Thank you!

In Yan Zhenqing's place, it is a night for men to study. Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young.

Midnight is the best time for boys to study every day. When I was a teenager, I only knew how to play and didn't know how to study hard. When I was old, I regretted why I didn't know how to study hard when I was young. This poem tells us that if you don't study hard when you are young, you will study at night when you are old. Commentary: It means hardworking people, diligent students, still working and studying in the middle of the night, and the lights are still on in the middle of the night. After turning off the lights and lying down for a short rest, the chickens crow at the fifth watch, and these hardworking people have to get up and be busy again. Appreciation of "Encouraging Learning" is an ancient poem by Yan Zhenqing, a poet in the Tang Dynasty. Encourage young people to cherish their youth, study hard and make a difference, otherwise it will be too late to regret. Let children understand that life is short, so as to improve their enthusiasm for learning. Poetry reveals this profound truth in just 28 words, and achieves the inspiring effect.