I'm pretty good with static languages (HTML, CSS) but I really struggle with any other ones.

Can anyone help me find a predone code or show me how to make a code (not worried about a language)?

Here's what the goal is: I have a marquee on the front page of a website. I want to be able to change the marquee on only one page, and it will be the same on every other page of the site. (I assume the text would come from an external text file).

Thanks if anyone helps!