Suggestions on where to get 3D training

Hi, new to the forum. I'm looking for any suggestions on where one can get quality, credited training via onlne courses for, at least, the basics in repair, maintenance and actually operating 3D printers. More along the lines of larger, high production units. Does such a thing exist? Have searched a bit online but haven't found much. Thanks.

Have you contacted the commercial depts of the big players ?

No I haven't. Had not thought of that. I was focused on a college, trade school, university kind of thing but I'll give your suggestion a try. Thanks.