Css is used for colors and layouts, used in websites and forum skins. I think it's best to check out this site if you want to learn. It helped me!
http://www.w3schools.com/css/default.asp

I learned CSS on W3Schools also, they provide some really good guides. Though I haven't read any for the longest.

Thanks for the link ExCal.
w3schools is a wonderful tutorial site for all those who want to learn about web design and programming.

I have to agree, w3schools is a very good site. I am currently using it to learn various web programming languages/tips and tricks.

No problem, I enjoy helping out. And yes I do aree with you all w3schools is one of the best tutorial sites around. Lot's of useful info

Cascading Style Sheets (CSS) is a good tool for webmasters. For one, it can ease your task if you change your site layout because all you have to deal with is a single file which is your CSS file. Otherwise, you have to change your page individually.

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I don't use the stylesheet for that much, because I prefer to just use CSS for small sections of my pages. I always create a stylesheet when I start a new template but rarely ever modify it after that. Normally, I'm too lazy to make everything look absolutely perfect. I don't know of many good tutorials, but downloading templates and looking at the code helped me a lot.

I also learned my CSS skills in w3schools but there are more references like w3c.org and other references found in just a search engine away

can you tell me what do you use for defineing a size of a table or css- divs.

im only familiar with px, are other units (%, em, etc) useful, which and how?
tnx