A few questions about my bike?

NicNac

New member
I just got a knew bike about a week ago for my birthday. It's from Walmart. It seems like the brakes don't work that good. I'm not sure if I just need to get used to the bike or if there really is a problem with it.
The front brakes squeak alot when i squeeze them. And the back brakes seem like they don't work at all. When i'm just sitting on my bike and not moving if i squeeze the back brake it seems to work fine but when i am moving it seems like it doesn't work at all.
How can I tell if there is a problem with the brakes or not?
How can i make the front brakes less squeaky?
Can i do something with the brakes myself to fix them if there's something wrong with them?
Is there a way to tighten the brakes or something?
 
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