You can usually tell that a yarn is chunky just by looking at it. Chunky yarn is only one term used to identify yarn types within the broader "bulky yarn" category. Many yarn brands will label the yarn as "chunky yarn," but there are a few other terms that brands may use to describe the yarn. These terms include "craft" and "rug" yarn. Check the label to be sure that a yarn is chunky.  Another way to identify chunky yarn is by its yarn weight symbol. The symbol for chunky yarn and all other forms of bulky yarn is "5."  A thicker yarn category is category 6, which is "super bulky." Some yarns in this category might be called "super chunky." Super chunky yarn and chunky yarn are not quite the same, so you should keep that in mind when making your yarn selection. Yarns can be made from different fibers, even yarns of a single thickness. Each fiber will have a different texture and appearance. Experiment with different fibers until you find one that you like.  As a general tip, consider the intended use of the project when picking out a fiber material. A blanket or scarf will need a softer yarn fiber than a rug or handbag would probably need. Acrylic wool is a mix of natural and synthetic fibers. It tends to be inexpensive and durable, making it ideal for projects like rugs and purses. It can also be used for sweaters and scarves but may not be soft enough for those with sensitive skin. Cotton wool is soft, durable, and natural. It is generally preferred for sweaters and scarves but may still be too rough for those with very sensitive skin, like infants and toddlers. The softest wools are cashmere, silk, mohair, lambs, and alpaca. Cashmere and silk wools are typically used for scarves, shawls, and wraps, but they are more delicate and require more care. Mohair, lambswool, and alpaca wool tend to be used for blankets and sweaters, but they also require special care. This step applies to any yarn you shop for, and chunky yarn is no exception. You'll need to figure out which color or colors you want to use for your project. Use any color that you like or that will meet the needs of your project.  Once you figure it out, buy the number of skeins you will need. It's better to have too many than too few. The dye can be slightly different from batch to batch, so buying the same hue by name at two different times can result in having two slightly different shades. You can avoid this problem if you buy the yarn all at once. To be on the safe side, you should also check the "lot" or "dye lot" number on the back label of each skein. Make sure that the dye lot number on each skein is the same before you buy them. Otherwise, you may still end up with different shades. The right crochet hook to use can vary by project and yarn type. If you are using a pattern, then the hook size might be indicated in the pattern. If you are not using a pattern, then check the yarn label for a recommendation. If you are not sure what hook size to use, choose a hook size that falls within the standard recommended range.  Larger hooks tend to be best for chunky yarn. In U.S. sizes, look for a hook between K-10-1/2 and M-13. In metric sizes, look for a hook between 6.5 and 9 mm. If you end up picking a super chunky yarn, the recommended hook size is M-13 and up in U.S. sizes or 9 mm and up in metric sizes.

Summary:
Select a chunky yarn. Consider different types of material. Find the right color. Choose the best hook size for your yarn.