Now that you've flooded Instagram with photos of black squares, it's time to hunker down for some real activism.

If you're a white person, you're sitting on top of about four centuries of institutionalized racism. In the wake of George Floyd's murder by police and countless Black Lives Matter protests across the nation, it's time to show up—with your body, with your voice, and with your brain.

It's no longer OK to just be "not racist." You have to be actively anti-racist, and there's a growing list of resources available to help you do just that. And what better way to learn than by sticking your nose into a book?

Below, we've compiled a list of 10 books—many of which are bestsellers—by Black authors that will give you a much more thorough understanding of how deeply racism runs in the United States.

Hood Feminism: Notes from the Women That a Movement Forgot by Mikki Kendall

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Although society has made strides in regards to modern feminism, it too often overlooks the plight of women of color. This book looks at the Black women who made incomparable contributions to the feminist movement.