Here is the process of how to customize the home page sections. Click on the customize option on the top bar, a left sidebar appears with the list of sections (Header, Footer, etc..) along with the pages present in the theme.
you can also notice the edit icon available for each section on the page you can click on the edit icon to edit a particular section. once you click the icon, a left sidebar displays with entire customizing options of each element that are present in that selected section.
So you can enjoy the easiest way of customization.