It is often said that forgiveness is a gift you give to yourself. When you forgive someone, you are letting go of the anger, resentment and hurt that they have caused you. Forgiving your mother can be a difficult thing to do, but it is important to remember that she is human and imperfect just like everyone else.
There are many ways to forgive your mother. One way is to simply tell her that you forgive her. This can be done in person, over the phone or in a letter/email. Another way to forgiveness is to let go of the anger and resentment you feel towards her. This doesn't mean forgetting what happened or pretending it didn't affect you; it just means moving on from the pain and hurt she caused.
It is also important to understand why your mother did what she did. If she was abusive, maybe she was abused herself as a child or suffered from some other trauma that led her to act out in this way. Understanding her backstory can help you see things from her perspective and have empathy for her, even if what she did was wrong.
Forgiving your mother is not easy, but it can be one of the most freeing things you ever do. It takes time, patience and practice but it will be worth it in the end when you no longer feel chained down by anger and resentment.