Two out of four of my kids learned to ride their bikes yesterday. One already figured it out a few years ago, and the youngest is thus far less motivated.
I'm very glad for them. Bike riding is fun.
I'm terrified. Bike riding can be dangerous.
...and I have learned how to: remove and replace a wheel, a tire, an inner tube, and readjust seats/handlebars and get a bike chain back in position. I don't particularlty enjoy getting my fingers greasy.
Seriously, I'm happy for my kids, though.