Which free multi-platform SDK should I use to develop mobile applications?

Question

Android

Hello!
Tell me, what free multi-platform SDK should I use to develop mobile applications?
I don’t know any specific programming languages, so it doesn’t matter what the SDK will be based on, it’s all the same to learn a new language.
Thanks everyone for the replies!

Answer 1

Intel XDK

Answer 2

Have you heard of the Android SDK? Cross-platform SDK for developing mobile applications. If you want to develop for IOS, then they have an SDK with the development environment, or rather not an SDK, but a assembler.
And in order not to rush from one language to another, we use the Xamarin development environment, we write code in C # for both Android and IOS.