If you are just arriving to the resistance, welcome. Some actions to take:
Read Black authors including Angela Davis, Bell Hooks, Maya Angelou, Marge Piercy, James Baldwin, Ta-Nahisi Coates, Alice Walker, Colson Whitehead, Audre Lorde, and Michelle and Barack Obama.
Spend your money at Black-owned businesses.
Refuse to spend your money at businesses that are not actively anti-racist.
Re-learn American history.
Seek out and celebrate Black art, innovation, success, and joy.
Vocally and visibly stand up to racism in action.
Raise compassionate children and talk to them about the inequalities of the system into which they were born.
Vote.
Continue in perpetuity.