I used to think coconut flour was just finely ground coconut flakes, but it is different! The flour has had the extra oil removed, so it's high in fiber and drier in recipes.
I like to buy this special organic coconut flour from iHerb. They have good prices and the shipping is always very quick. If you use my referal code DEW779 you can get $10 off your first purchase!
Since it is so dry, you can use much less flour but you need to increase the amount of liquid or eggs. On the back of my bag of flour, it says to replace up to 25% of the flour called for in the recipe (use rice flour for the rest if you want it gluten-free) and increase the amount of liquid by the same amount of flour you are using.
I've mainly used recipes written specifically for this type of flour, but I did try substituting it in a quiche recipe. I found that I could use one quarter the amount of flour in the original recipe and I didn't have to add more liquid or eggs, I just added more vegetables to make up for less volume.