Because I have a limited knowledge of HTML, I have been asked to help redesign a club website

It has 42 pages all of which have the same top 2/3rd with different content in the bottom third.

I have been told that the best way to structure this is with SSI. Is it ?

And whilst I have read loads on the internet of how to link the pages, I just cannot grasp the starting pont.

I suspect that I should save the "basic page" as includes.shtml and then somehow link each bottom page to that, but I cannot get it.

If I may quote a page without any advertising of course, it's

All of the black area is one page. Each of the 42 pages have different content on the grey bit.

Is it practical ? If not what should I do and how would I do it ?

Thanks for reading