2022 fix and add

current wordpress website is 8 pages and made from scratch, not a template, so adding sections is not something I can do. I would like to add sections to my pages so I can try to get the proper titles and text to increase my seo standing. My current editing capability is limited by the page I am attaching. Can you add a couple Title and text sections and a map at the bottom of each page and everything work normal on all devices?