Is is better to pick 50 keywords and post them on every single page of your website, or should I use different sets for separate pages.
I am talking about websites where separate pages providing information of different services.
For example www.windowsruspgh.com is a company focusing on replacement windows, but they also do siding and roofing.
Should my keywords on ie roofing page focus on roof topic?

Yes, use keywords that relate specifically to each individual page. So, a page about roofing would have key phrases which relate to roofing.

Ensure that your title tag and H1 tag have your best key phrases for each page.
(If you're not sure what these things are, some of the moderators have links to SEO ebooks and info in their signatures - which will get you on the right road.)

__________________
Make Website

Also make sure the keywords you are using are within the text of the page that any visitor can see.

__________________
Regards Chris,
Sites are view in FF & IE, with res @ 1024 x 768 on 19” screens.

Barnet walks
How to ask for help on the forum. - VH prices. - BV Tutorials. - Using PIXresizer - Image/Photo Tips -
Collectables, Collecting