Surveyor training
If there is no foundation, it is best to train the school system to learn. Without a foundation, there is no need for general surveying and mapping, and the master can't teach well. It is faster and more comprehensive to study systematically in training schools than to learn from masters, and the tuition is not very expensive. After you learn well, you will do surveying and mapping work, and the tuition fee is not as high as your monthly salary.