“What is the practice for someone “WHO WANTS TO DEVELOP THE POWER OF ERADICATING ALL DEFILEMENTS…” and liberate the mind from suffering?”

A: It always begins with basic morality. If you want to eradicate suffering you have to start with not causing it. That’s the foundation stone. If you miss that out or if it is defective, any “practice” which you build will be defective and will let you down at some point in time. The magnitude of your suffering will then have become proportionately greater.