Kěbù kěyǐ tígōng R,C,F yǔyán de jiàoxué hé liànxí
Can you provide teaching and practice in R, C, F language?
I assume you mean the programming languages, C, and the less common R and F.
FCC focuses on web development. These languages aren’t commonly used in web dev. Even within web dev there is a myriad of choices and FCC can only focus on a sliver of them, specifically the MERN stack. There are other resources on the web to learn nearly any languages you want.