Using Android Studio with minimum disk space

I have limited disk space and want to start developing android, but it seems that android studio eats a lot of memory! some says it took more than 20 GB.

So the question is: what are the minimum necessary components (android platforms, emulator, ...) to start and how can we use android studio with the most possible minimality?

Also, how does adding each of these components (that are respectively unnecessary) affects the used space?

How much storage do I need for Android Studio?

Hardware requirements A 64-bit environment is required for Android 2.3. x (Gingerbread) and higher versions, including the master branch. You can compile older versions on 32-bit systems. At least 250GB of free disk space to check out the code and an extra 150 GB to build it.

What is the minimum capacity of RAM is required for Android Studio?

Memory: 8 GB RAM. Free storage: 8 GB. Screen resolution: 1280 x 800.

2G RAM for AS, 1G RAM for Gradle,

~8G HDD for SDK (incl. NDK),

700M HDD for AS,

~2GB HDD for AS config and caches,

~500M HDD for one project + whatever emulators take

As Eugen Pechanec said as a comment.
I think this is the maximum.