: How do I play this mordent? What's the second note I play? It's in the key of C major

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What's the second note I play? It's in the key of C major

You have to play G.

From Wikipedia,

The mordent is thought of as a rapid single alternation between an indicated note, the note above (the upper mordent) or below (the lower mordent) and the indicated note again.
The upper mordent is indicated by a short squiggle; the lower mordent is the same with a short vertical line through it:
en.wikipedia.org/wiki/Mordent

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Since you're in the key of C your second note will be G.

The auxiliary note is the next note in the key: a mordent goes to G, a reverse mordent to E natural. If the composer wants a note outside the key you'll see an accidental above the mordent symbol.