I try to figure out what people need from the software I work on, and then translate that into pics.
I work from home, so a student would see me in my pajamas, nursing a cup of coffee, for an hour or two at the start of the day! I have a combination of video calls and group messaging for staying in touch with my team, and I switch between writing about our software - upcoming features, plans, roadmaps - and designing screens, coding little prototypes, and sketching on my notepad.
Here's the first step for high school students
Draw and sketch and play with computers and try stuff _all the time_. Be obsessive. Take other people's work apart and put it back together again. Nothing is more useful for a career in product design than actually getting to the bottom of how things are made.