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1) its often easier to either get college teacher to come to teach course or to go to college to attend the course often its more than one day. main reason you can ask a teacher a question and get a answer in a minute. same reason if you got 2000 pages of operator manuals on a machine it takes much longer to find a answer and almost always 1000x faster to ask a person a question and get a answer in a minute
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2) usually you attend the class or course and get a small book on gd&t which was used for class so students are familiar with small book and can keep close by for reference at work
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