Phone ports: Android step by step

A phone port is not an emulator and not a random APK: it is the original game recompiled for ARM64 and packaged as a normal Android app. This is what changes, what you need and how to install it without handing your phone to a stranger.

It is not an emulator: The game runs natively on the phone's CPU. There is no console being simulated, so performance and battery life are usually better than with an emulator.
You still need your copy: The app does not include the game's data. You extract it from your own legal copy and place it where the project's README says.
Official APK only: Download from the project's GitHub or website. Repackaged APKs from aggregators are the most common way to get malware.
ARM64 and a modern GPU: Most current ports are ARM64 and ask for Vulkan 1.0 or OpenGL ES 3.2. A 2019 phone on Android 10 can work; a 2016 phone probably will not.
Controls: Some ports ship touch controls; others expect a Bluetooth gamepad. Check the entry before installing.
Storage and permissions: Reserve several GB and review the permissions. A port never needs your contacts, SMS or location.

Step by step

Open the entry and confirm that Android appears under platforms.
Follow the official link and download the release built for arm64-v8a.
Install the APK from your file manager. Android will ask to allow 'unknown apps' for that manager; that is expected.
Copy the game data into the folder named in the README, then open the app.
If it fails, check the Android version, Vulkan support and free space before trying another build.

Red flag: a page that asks for payment, uses link shorteners or installs a second 'installer'. Go back to the catalog entry and use its official link.