Learn that the letter C can make the "kuh" sound, like in cat and cup, and find that sound at the start of words.
The letter C often makes a short, crisp sound: kuh, from the back of your mouth. Cat starts with kuh. Cup starts with kuh too!
Say kuh with me, nice and short.
Mastery looks like: They can produce the "kuh" sound on request and identify whether a spoken word starts with it.
Common stumbles: Saying the letter name "see" instead of the sound "kuh"; confusing kuh with the similar back-of-mouth guh sound learned later.