If you're buying that case then you're good it comes with 3. I was just making sure you have some, as some cases don't come with any. Be aware though they are more than likely cheap sleeve bearing fans. The cpu fan you chose is fine and has a good long life bearing. Your computer build looks good.
What I meant by etc. Sometimes people don't like the built in on board sound, NIC, front panel, fans, and might want better quality than what comes with.
Remember, they manufacture these things as cheap as possible. A manufacturer can tell me all they want about quality and performance, but non of that makes a difference to me till I see the rubber on the road, so to speak. I have seen cheap motherboards perform like a 300 dollar one and I have seen 300 dollar mobo's head to the landfill right out of the box. You never know what you're going to get.