Can we friend up for a Second?

So, right now the black lives matter act is still going strong, but I'm not sure what it means. I'm white but that doesn't mean I don't care. What is it really meaning, so many people I think are taking it out of context or maybe the white people just don't understand it so they came up with all lives matter. I'm guess I'm stupid when it comes racism because i don't see a point in it. Can someone please explain to me what it truly means, and if white people are taking it the wrong way?