Memory is trainable, 30 passwords is nothing. Before mobile phones, most people probably knew by heart about 30 phone numbers. But I'll admit it's not practica

Memory is trainable, 30 passwords is nothing. Before mobile phones, most people probably knew by heart about 30 phone numbers. But I'll admit it's not practical. You could also just remember one password and have an online password manager (I don't know if it exists though).