In learning how to make the most of your webpage, it is important to understand the lying concepts behind Google webpage crawling.For one, you have to distinguish the three major types of links, namely, one-way link, reciprocal links, and three-way links. How do they differ? At the mere sight of their names, it is quite obvious. But there is more to them than mere terms. It may affect your Google standing altogether.
Link: 'One-way links, reciprocal links, three-way-links. What's best?' - Axandra Search Engine Facts