This pattern is written in English, in US Terms and only three stitches are needed, (chain, single crochet and popcorn) and the pattern has picture directions for the popcorn stitch.

You can use either the written instructions, the counted graph, or both to make your version of this blanket

The one pictured was made in Aran with a 5mm hook and measures 51 x 43 inches. Getting an exact gauge is not important. You can use any weight yarn for this blanket, just be sure to use the hook size recommended by the yarn manufacturer.