Host text file on server and retrieve it in HTML

I have a website and on every page, I have some common text which should be same on every page, say, the footer note.

But since my website is in construction, I may change this note from time to time. So I would have to change it on many other pages manually.

I was seeking for a way that I could host a .txt file on my web server and load it into a the <p> tag using some web programming language.

I don't know anything regarding this and that's why I cannot provide any codes regarding this.