Ask HN: How to Stay Focus?

What is the best way to focus? I'm often being distracted by everything around me while working. At the office, I heard what my colleague discuss and always want to jump in. When wfh, noise from cars, tv, fam members talk...also borders me a lot. I've tried using headphone but I don't think it work. Can you guys give me some recommendation on how you apply to stay focus?