[Amresh]

Also I will suggest mimo.... its UI is kinda nice and clean ......
I have tried it but its not free!
it gives you the starting lessons for free and after then you have to pay for the courses.....

Sorry but I have used its mod apk on bluestacks(so that no virus will harm my phone) and worked fine and all the courses were available for free.....

I do not encourage mods tho! 

If you are very much curious to learn coding then try buying mimo sub.......
And before buying you can take the taste by their free lessons of each language course.....

happy coding :-)