Many who don’t have a science background, let alone one in genetics, feel a bit intimidated by the thought of using DNA in their genealogy research. Rest assured, many others who felt just the same have gotten a handle on it and continue to learn and explore!
Whether you prefer to learn by reading or watching a video with graphics, there are now copius educational materials online, from beginner to advanced. A simple web search with your question is likely to provide a fairly quick answer. Here are a few other resources to get you started:
“DNA for Beginners: The Three Tests” by Debbie Kennett
“Identifying Possible Common Ancestors Utilizing Multiple Tests” by Roberta Estes