What's the best way to make parts of a website appear multiple times with the same content?

If I have a page that is divided into three parts: a header, a body, and a footer. And the header and footer each have a word that needs to change depending on the page, but all of the pages have the same word "Home" in the header. How would I code the website in a way that I can change the word home once and it changes across all pages?<br><br>If that makes any sense. Sorry I'm a beginner. Let me know where I can go to learn more about this topic.