I have a question for the experienced ones who went to school for this trade (and other experienced people or others who are beginning)

So I’m still in school 8 days until I graduate (already have a job set in stone). I did my weld tests, but it felt SO much different than a booth. As it should. However, graduates from school or experienced what are some of the best tips you can give a new person to the field who’s been going to school for a year and what are some of the best tips you could give yourself looking back to when you first started? To me it seemed much different. The job is MIG and fabrication. Everyone I talked to at the site basically said the same thing “what you learned in school is much different than here”. I also got a lot of “the only way to learn is to do the work” Thanks in advanced!