Please note that the photo and video tutorials at the website, and within the pdf, seem to be inactive. The written instructions are still available.
The granny shrug is made from two granny hexagons joined together. It can be made in a wide range of sizes from child to adult, just keep adding rounds until it gets to the size you want. Similarly, experiment with yarn type and hook size - you might want to use two strands of 8 ply held together rather than using 14 ply, or might mix a chunky yarn with a finer one.
There are two versions of the instructions. A traditionally written pdf is available HERE and there are step-by-step photographs and a video tutorial available from kootoyoo HERE. It’s all about whatever way suits you best!
Have fun crocheting your granny shrug - if you can crochet a granny square you can make this! Wear it with pride!