Intarsia help

I’m knitting intarsia for the first time and I’m doing something wrong. I watched the video, and I get how to knit with the different strands, but I’m having trouble adding the new color to begin with.

there was a big hole where I added the new color.

I haven’t done it, but I know you are supposed to twist the yarns or something to prevent holes.

Amy has a video here and I’m sure someone who knows more can help you, too.

Check out the video, and remember to hold the color you’re dropping over to the left before you pick up the new color, so the new color comes up from under the old one. Here’s another good reference.