It was through collecting my "hard earned" satoshis through the faucet I installed on my cheap Android phone back in the day (it was named something like hotBTC or something? the faucet's logo was a flame); withdrawing those few satoshis to my freshly installed and backed-up Mycelium wallet.
Man, those were the days.
Good ol'days. I started by reading a random article on the internet, then created my first wallet on Blockchain.com and started messing with faucets. Back then, there were so many faucets that your mind couldn't perceive them. I remember countless lists of some kind of provider, of which I can't remember their names, who were acting like middlemen. Multiple faucets paid directly to them, and after accumulating a decent amount, you could go ahead and withdraw it to your actual wallet. I'm pretty sure that in the hypothetical scenario of these middlemen still existing today, I'd have decent amounts of BTC abandoned in them. Then there was the Xapo wallet, which had its own list of faucets that paid directly to their wallet.
Oh man, I wish I could go back in time, not just for the BTC but to relive being young and carefree.