There is not much to specify for the question, its really simple: Which title is the first game you have purchased on Steam? Was it a good decision? How much did you pay? When was it and what device? You don’t have to answer all questions, this is just a fun discussion to have.
You can check your history: https://store.steampowered.com/account/history/ Edit: Some in the comments pointed out that the purchase history doesn’t go back all to the beginnings of Steam. So if you purchased something earlier, it won’t be listed on your account.
(I reply with my game too.)
I didn’t have to look it up to see what game it was, but I didn’t remember the price. I bought Portal for $19.95 almost 19 years ago. Played it on a Windows PC that was not focused on gaming. I guess I’ve also played it on every computer I’ve had since then, including my new-to-me refurb Steam Deck a couple days ago.
Hey congratz on the Steam Deck! I personally can’t play Portal, I always get motion sickness. Not sure when this started happening with me, but this really bugs me. I love that game!