Why is it advisable to add salt as a technique to make beans cook faster?

Adding salt to beans can help them cook faster because it can increase the temperature at which the beans soften. Salt can also enhance the beans' flavor and help maintain their structure during cooking. However, it's important to add salt at the right time; adding it too early can toughen the beans' skin, so it's often recommended to add it after the beans have started to soften.