It just makes it easier to read if the question is in the body or text of your post.
Welcome to Knitting Help! To help you with abbreviations there is also a glossary at the tabs on the top of the page along with some great videos. The videos are free.
There are lots of knitters who only buy yarns at hobby,craft and discount stores and there are those who only buy yarn at yarn stores. It doesn't matter where you get it if you like it.