I'm the CTO of The Perfect Workout, the largest privately-owned 1-on-1 personal training company in the United States.
I learned the ColdFusion scripting language when I was a teenager, and quickly discovered that there weren't many web hosts that supported it. This led to one of my earliest business ventures: reselling ColdFusion web hosting. I had some initial success selling to students learning ColdFusion at the local community college, and I eventually had customers all over the world.
I also spent a lot of time in my teens working with affiliate marketing. My most successful site at the time provided news, curated links, reviews, and giveaways for the LDS community. This venture taught me a valuable life lesson when my web host abruptly vanished, taking my website and all of its content with it: keep backups!