Er and ir verbs are used to talk about activities. For er verbs the yo form is o. Tu form is es and el, ella, and ud. is e. If you're using the nosotros or nosotras form you take off the ending and add emos. Ellos, ellas, and uds. add en. Some examples of er verbs are beber which means to drink and aprender which means to learn.
This is a chart on how to conjugate ir verbs. Some examples of ir verbs are vivir which means to live and abrir which means to open.