可不可以提供c,r,f, 語言的教學和練習

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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.