1. Make a wish before you blow out the candle light.

2. Make wish before you blow out the candle light.
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Are both OK? Which one is right? Do we have to put 'a' before 'wish'?

2 answers

Yes, you need the "a" before "wish". "Wish" can be a noun or a verb. "A" wish specifies one wish as a noun. If I wrote, "I wish for rain", "wish" is a verb.
You should also omit the word "light." The phrasing is "blow out the candle."