Communication
Good communication can build a relationship, and bad communication can destroy it. It's a powerful tool, and it's important to be able to communicate effectively. Whatever your message is, if you can't make it known, then it's futile. We live in "the communication age" right? But with all of this technology and innovations, it still comes down to dealing with people.
Text seems to be an increasingly common means of relating important messages, but it leaves a lot to be desired. Great writers and poets have been using this for years, but as interesting as that is, it's relationships that require communication the most. It's so difficult to convey proper meaning through text mediums, such as chatting on the internet. You have to be very careful of your wording, so that your audience will interpret your words to the meaning you intended.
Being understanding and open-hearted is key. You should give the benefit of the doubt, and never automatically assume that your friend or loved one intends to hurt you. But at the same time, be fully open and honest with each other. Trust. If you can keep that up, I guarantee that things will go well. I know from experience.
Ideally, there is more than text. Tone of voice is another essential tool in conveying your thoughts. The emotional inflections and implied meanings will surely help. Talk in person, use the phone, VoIP, whatever.
Then of course, body language. Whether it's gestures, or a great big hug, nothing sends meaning and intent like an action. A smile does wonders to warm the heart. Webcams are nice, but meet in person! A handshake with a business partner develops trust and familiarity. Or in a different situation, there would be no way to pull off a long-distance relationship you didn't meet on a regular basis. There's nothing better than holding a loved one, expressing your feelings, and sharing your dreams, fears, hopes, and desires.