Where can I practice C programming for free?

Android is based on Linux Kernel so it’s definitely possible to compile & run C/C++ programs on Android. C is quite cross-platform , so a C Program written in Windows can Run on Linux ( and android ) and vice versa.

20 Ways To Learn C Programming For Free

C Programming Best Practices

Following are the best websites for practicing programming languages like c , c++ ,c# ,python,etc.. ,