What was something you started doing that was complex at first, but as you continued to do it, you became a pro at it?

Walking

Harmonic analysis in music theory.

Im a pro at anything crafty. Also most any type of needlework. I can fix almost anything except electricity and plumbing.

Fixing things around the house
Or doing brake jobs on cars

Prolly tetris in it's rapid mode
Or econ maths

Most things I take interest in...

Cooking but I'm not a pro. ha

Cryptic crosswords

whatsapp..lol

Estimating car wrecks and damage