Doing something for the sake of learning doesn't ever feel like wasted time. When I was first getting into networking I wanted to connect two computers directly without have a router or a switch between them. I carefully researched how to cut and crimp an ethernet cable into be a crossover cable, and successfully connected the two.
Feeling proud of myself, I scrolled farther down the page that described it only to read that most NICs will automatically do it for you and you don't need to make crossover cables any more. I'm still glad I took the time.