Congrats! You've discovered a secret page. Natural curiosity is a great skill that deserves to be rewarded. Allow me to share all of my emulation resources with you in the name of data preservation.
We are headed towards a world where physical media will no longer exist. All content will be digitally leased to you. The signs are there. Everything is turning into a subscription service. Best Buy will stop carrying physical media. And Sony is cutting blu-ray production, while the prevailing winds point towards their eventual ceasing of disc production all together. Buy yourself a big ol hard drive and start owning the things you like.
An adblocker is generally recommended as you delve into the world of emulation and roms.
Consider playing on original hardware plugged into a CRT TV for maximum nostalgia!
Legal disclaimer: Emulation is legal. Downloading roms of games you don't own could be considered illegal unless you own a physical copy of the game. In reality, no regular person has been sued for downloading roms. Now, if you distribute roms or emulators, and you get paid for it, you're treading a little closer to danger. The Nintendo switch emulator, Yuzu, was doing just fine until they started raking in cash and telling people how to pirate Switch games. Stick to the retro era of games and you'll be hunky dory. If there's no legal way to purchase new copies of a game, then there are no moral issues either.