How do i factory reset my mac?

To factory reset your Mac follow the directions here:

What to do before you sell, give away, or trade in your Mac - Apple Support

Writing an effective Apple Support Commun… - Apple Community

Hi, do you have a question?

Hi, this is not a social media site. But welcome anyway.

Well that's nice but the way ASC works is via question and answer for technical support. If you don't have a technical question your post will be considered inappropriate and will be deleted.