How do I customize form error messages?

In my login form, I have this code:

 {% if login_form.non_field_errors %}
  <p class="text-danger">{{ login_form.non_field_errors.as_text|cut:"* "|escape }}</p>
 {% endif %}

If a user enters the wrong username/password combo, the error reads like this: 'Please enter a correct username and password. Note that both fields may be case-sensitive." I'd like to change this message and other error messages. How do I do this?

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