[radaroptical]

Where can I learn c interactively?

[saltycracker]

Isn't all learning interactive?

[Sajuuk]

There's not a whole lot of interactive learning sites teaching C. Nowadays most beginners are learning Python right off the bat from nothing, and if they do end up having some need to learn C it's usually much farther on down the road. If you already know Python, C honestly shouldn't be that difficult to learn (even using some learning resource that's not interactive, such as a book). They share much of the same syntax, Python is essentially just a simplified version of C with superior readability.

[tux1]

It depends what you mean by interactive, there is an app called sololearn that you can use. However the best way to learn any language is to practise making programs!