The more we understand ourselves, the more we understand others. As individuals we have various needs as seen in Maslow’s hierarchy, many of which involve other people.
One of the most fundamental needs is that of a relationship. We have physical sexual needs, emotional and love needs, as well as general companionship and spiritual alignment needs. These should all be considered when looking for partners, and we should consider what we are able to provide in order to increase our value in the relationship marketplace.
Another common area of social interaction is friendship and family. In both we seek to provide mutual support to those who share our values and our blood. Basic concepts of evolution and reciprocity apply here. If you are kind and cooperative, others will be as well. Similar goes for more neutral relationships like business partnerships and coworkers.
One common theme and skill to carry across all relationships is the ability to communicate. This includes key factors like being able to regulate emotions, speak truthfully, think logically, and empathize(know your audience). We need to regulate our emotions especially when we get frustrated, or when we something might feel like an attack. We need to always make sure we are being truthful and not misinforming. Likewise we need to be logical, rational, consistent, make sense. And last the ability to empathize, to understand who our audience is, what their context is, why they think the way they do. And so forth.
The Natural Order 