Red wine is a broad topic, it can be made simple or very difficult. The main grapes are Cabernet Sauvignon, Merlot, Syrah/Shiras and Pinot Noir.
One very important thing to remember is that some wines need to be consumed at young age, after a couple of years they start turning into vinegar. On the other hand, especially expensive red wines may need more than 20 years before they start to mature.