Well I am new to this thread and thought that I would make my first post about some rules I am unsure about.
Before you read the questions and just think I am a stupid moron, that needs to get a life etc etc, let me just explain my situation. I stopped playing GW for about 3 years but have decided to get back into it. I stopped before the newest addidtion of 40k came out and there are just a couple of rules I am unsure off, and I have not got round to buying the rule book yet, wanted to make my army list first

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Anyway for the questions.
1) Some of my troops are classed as beasts (what does this mean)?
2) What does the Preferred Enemy rule do?
Im sure there were a couple more but cant think of them at present.
Thanks in advance.