Yahoo Ranking important factors ?

[gaskill]

Hello friends,
I haves some questions:
1. What's the meaning for related link ?
2. some web site has only 10 link can also go to first position..why ?
3. Directory is from directory .. is it another link ?
4. Is the subdomain is not good?
5. How about the location and e.g .co.in ?? compared to .com?