How Can I Learn About SEO For Yahoo, Including Yahoo's Algorithm?

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I am unable to rank well in Yahoo's search engine, but would appreciate any kind of help. Basically I have some sites that rank quite well in Google, but these sites don't seem to appear anywhere near the top results in Yahoo. I'm just wondering, how can I learn how to optimise my website for Yahoo? Is there any kind of guide I can read, or any information about the Yahoo search engine algorithm? I've tried searching for information at the search engines but most results are articles that are about 2 years old - and I just don't think they contain any of the latest up to date info