How to port pc games on android?
As a game dev I want to emphasize: you can't just take a .exe file from a PC game and make it run on Android. They're completely different architectures (x86 vs ARM) and operating systems. What you see as "ports" are actually complete re-implementations or use compatibility layers.
For modern games streaming is your best bet. I use Moonlight with an NVIDIA Shield-capable GPU on my PC and it works amazingly with a Bluetooth controller. For older games DOSBox is magic - I've played old Sierra adventure games and even early Fallout on my phone. Some dedicated communities have made Android ports of open-source games (like OpenTTD OpenMW for Morrowind) but these are exceptions. Manage your expectations - you won't be playing Cyberpunk 2077 natively on your phone anytime soon!
Porting PC games to Android isn't a simple task - it's actually complex software development work that requires access to the game's source code which most gamers don't have. What you're probably asking about is playing PC games on Android which is possible through several methods:
1) Remote Play/Streaming: Use apps like Steam Link Moonlight or Parsec to stream games from your powerful PC to your Android device over your home network. Your PC runs the game and your phone displays it and sends back control inputs. This works well with a good WiFi connection. 2) Emulation: For older PC games (DOS/Windows 95/98 era) use emulators like DOSBox Turbo or ExaGear (though the latter is hard to find now). 3) Cloud Gaming: Services like Xbox Cloud Gaming GeForce Now or Amazon Luna let you play PC games streamed from their servers. 4) Native Android Ports: Some games have official Android versions (like GTA series Civilization VI XCOM). Check the Play Store.
True "porting" (converting the game to run natively on Android) requires the original game engine source code knowledge of C++/Java and Android NDK development. Some indie developers do this but it's not something an end-user can typically do. The EmulationOnAndroid subreddit has great guides for playing older PC games on mobile.