Two strands of Yarn?

I just started knitting and I’m trying to make an Afghan for my son, the pattern says to work holding two strands of yarn together.

Does this simply mean to just hold two strands of yarn like one strand and knit like that?

And if so, what is the easiest way to do that? I’m using 3 big 1lbs pound balls of yarn and I don’t see how to have two strands at once.

You are exactly right. Just take one strand from each of 2 balls and hold them as one strand. When you are done with those two, you’ll have to find the center pull strand from the third ball and hold it together with the outside strand.

Thank you!!