Getting started with Android Emulator using Android Command Line Tools
Install Android Emulator without installing Android Studio: Getting started with Android Command Line Tools
So, you're looking for an Android emulator which is ad-free, gives you the latest AOSP versions of Android and doesn't take up a lot of resources but Android Studio takes up a lot of resources? Good news for you, I'll explain how you can install Android Studio's emulator without actually installing Android Studio.
This is particularly useful for people who have a low-spec PC/laptop and wants to use Google's official Android Emulator and it works on Windows, MacOS and Linux.