When following one of my patterns, in the material section, you will see the yarn I used for that project. I don't give specific brands because they might not be available to you. I indicate the colour and also the yarn weight.
Yarn weight refers to its thickness. Using different types of yarn or hook can change the project significantly. Even though in amigurumi gauge isn't important (what's important is that you use a yarn, tension and hook that results in tight enough stitches that the stuffing doesn't show) I want you to achieve an end result that resembles mine (of course you can personalize it how ever you want).
So if a pattern asks for a medium weight or a light weight yarn, what does that mean? Do I mean aran, worsted, 8 ply, 9 ply... ? If you're not familiar with those terms or, like me, like simpler and more concrete measures keep reading!