Do we know on-page SEO optimization? If yes, please share your expertise.

How to define Page Title? How to define meta descriptions? How to define an H1 Tag? How to define above-the-fold content? How to define H2 Tag? How do define image name, alt tag? Best practice of Page Speed (Lighthouse) score? And so many things? Let's discuss what are the most important factor and why and how we can improve it to outrank our competitors without backlinks.