Question about Yarn & Gauges

I’m a new knitter and I’m looking at patterns I want to do in the future and I have a question about gauges. How do I know what type of yarn to buy if they give you a gauge of 4 inches in garter stitch instead of stockinette without making a swatch. Also if they give me a pattern gauge in 4 inches instead of a swatch. Is there a way to figure this out without making a swatch so I know what yarn to buy?

Look up the yarn the pattern uses and find what [B]its[/B] gauge is; may not be the same as in the pattern. Go to the manufacturer’s site to find out or, where you can search for other yarns that are listed as the same gauge.

Thank you I can’t believe I didn’t figure that out. Thanks.