It’s super simple @craftADDchick . You chain an odd number and starting in second chain from hook you alternate single crochet, double crochet. Ending with double crochet and you should have an even number of stitches. Then chain one and turn.
Then repeat single, double, single, double. So that each new single crochet is in a double from the previous row and each new double is in a single of the previous row.
I really like the look of this pattern and use it for dishcloths and used it on this blanket.