For development, you need to know the Lua scripting language, the project can be compiled for iOS or Android with minimal changes.
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Corona Platform
The platform is free, the developer can take all the profits from the game. The creators of the Corona SDK earn by selling plugins in the internal store.
Is an engine for creating 2D games: platformers, top-down shooters and isometric games.
Examples of games on Corona SDK: Zip-Zap, Gunman Taco Truck; Fun Run 2; PKTBALL; I Love Hue.
Pros of Corona SDK:
Built-in Android and iOS emulator, the result can be checked directly on the platform;
The platform allows you to quickly make a beautiful interface;
Optimized compiler, Corona SDK games run only slightly slower than native ones.
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Compilation requires internet. The platform sends the bytecode to the Corona servers, which compile it into an executable;
You can not add third-party plugins or libraries, only buy from the Corona store. For example, you will have to buy a plugin to display ads;