You might learn on the side, e.g. read a relevant book during a train commute. But you can also learn on the job. Here it can be about optics though and what ot

You might learn on the side, e.g. read a relevant book during a train commute. But you can also learn on the job. Here it can be about optics though and what others around you think is fair: reading a book at the desk for hours doesn't look productive, while browsing online help for hours does. As freelancer I've billed hours for literally reading a book at home. They wanted me to know and be able to debug a critical storage system if something goes wrong. I believe my fees were still lower than finding another person.