Here are some ways to keep those communications private. While these tips were designed for journalists and confidential sources, they're just as useful for protecting any private communications, such as a conversation between family members, or a confidential business dealing.
Some tactics are more difficult than others, but the good news is that not all of them require technical skills. The key is to figure out your communication strategy. First, decide if you are trying to hide WHO you are talking to (metadata) or WHAT you are talking about (content), or BOTH.