Learn French: Ce qui me dérange, c'est la viande crue.

Ce qui means "what" when it acts as the subject of the verb. In this sentence, it is the thing doing the bothering (dérange). If "what" were the object of the verb, like in "what I see" (ce que je vois), you would use ce que.

Why do we say , c'est instead of just est?

When a sentence starts with a long subject phrase like ce qui me dérange, French usually uses a comma and adds ce (here as c') to echo the subject before the verb est. It literally translates to "What bothers me, it is raw meat."

Why does the adjective crue come after la viande and end in an "e"?

Most French adjectives, including physical states like cru (raw), go after the noun. It gets an extra "e" to become crue because it must agree with the feminine noun la viande.

Why is me placed before dérange?

In French, object pronouns like me go directly in front of the verb they belong to, unlike in English where they follow the verb.