You may have a formal relationship with a teacher and course of study, or you may go it alone relying on various inputs, but at the end of the day, the student is responsible for absorbing the information. No one else can do that for you. As for me, I studied printing technology to prepare myself for a career in Industrial Education. I lasted one year teaching public school. My education introduced me to type via foundry and Ludlow typesetting and letterpress and offset lithographic printing. I loved all of it.
As a Graduate Assistant I taught classes in offset printing and graphic production and half of my students came from the art department across campus. It was through them that I discovered Graphic Design. I had the good fortune of studying magic marker lettering with Ed Benguiat and that set me on my way drawing lettering and type. Once the personal computer and font editing software became available I embraced font making. I've had a number of opportunities at the dawn of digital font making that allowed me to hone my skills and I just kept going.
I now teach type design to undergraduate design students and although I would like to take some credit for their success, it still comes down to how motivated the individual student is and how much effort they put into their work. My 2:40 contact time with them once a week does not begin to cover the work they must do on their own.
ClearviewHwy has Positive and Negative Contrast versions as well. Millbank has its terminology backwards, at least as it relates to signage and Human Factors Research. Light Letters on Dark backgrounds are referred to Positive Contrast, Dark letters on light backgrounds are referred to as Negative Contrast. It took me awhile for that to sink in when I was first exposed to it.