hello friends,

I want ask these question of SEO techniques related which is avoid SEO whenever we optimize website then we should avoid those trick..

just like a:-

1. Keywords Stuffing
2. Cloaking
3. Doorway Pages
4. Link Farming
5. Page Hijacking
6. Mirror Websites
7. Buying Expired Domains
8. Selling Page Rank

i think you know this thing but i could not understand that what is this..

so anybody could you explain now..spacialy:- keywords stuffing, cloaking, and doorway pages