What does k2(3,3,3) mean?

Sorry if this is a dumb question, but I’m just a little confused. I’m trying to knit someone a pair of slippers for their birthday and I’m kinda new at this.
Here is what the instructions say, and I dont know if its telling me to just knit six or knit 2 and then do something else. Help! Or does it mean knit two of the stitches together in one move three times???

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It is for different sizes. Depending on the size you are knitting you are either supposed to do K2 or K3.

Oh! So, I’m supposed to just knit 3 if it’s a bigger size? So, K3???

Yes, that is what it means.