First start with just a couple of hardwoods from your area. Keeping it down to just a couple will not bog you down with too much to learn at one time. Find one that is living that you can identify easily, then go through the woods looking only for and identifying that specific tree. Look at the leaves, bark, and general structure shape. Look for young and old trees both, because the bark can look a little different on a 5 year old tree vs a 30 year old tree. Look at the dead branches on the tree and how the bark and tips look where the leaves would have been.Look at the color of the wood and h