Here is a video tutorial for crocheting front and back loops as well as the posts. I know that sounds confusing to some people and trust me I was so confused when I came across it in a pattern I was attempting to do a little while ago called the Rainbow Dragon Backpack. So I needed to watch the video that they had to figure out what they were talking about 🙂
I found this video on YouTube from the Crochet Crowd.
Hope this helps 🙂
P.S. if anyone would like the pattern to the Rainbow Dragon Backpack you can find it on my blog https://magicalstash.com/2017/02/01/rainbow-dragon-backpack/