This poem is so popular that you can understand it as soon as you read it. The poet advised us to grasp the present, study hard and work down to earth. Only by "painting your present picture with your heart" will your future career be brilliant and your life path be broad. Only by "recalling the past" can we "not regret wasting time and not be ashamed of doing nothing"! Only in this way can you proudly say that my life is full and meaningful. A word "be careful" can penetrate the back of the paper with exquisite words and infinite care and exhortation.
I hope I can help you ~ there are other poems in the resources, you can have a look.