CSS

I have four "hobby" web pages written in old-style HTML.  Because of some of
the JavaScript, they don't validate.  If I remove the JavaScript they do,
but the JS is in links to other sites that I don't want to remove.

Now I'm contemplating moving to Style Sheets, but am wondering if the "need"
to do so is worth the trouble.  My few pages are each quite different
(fonts, backgrounds, etc.).  Can anyone shed light on just "when" it is
important to move to CSS?  I have to admit that when I did some research on
it my eyes began to cross and it didn't sink in.

Thanks in advance,

Caryl

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