There is a lot of advice to be found regarding photography during the autumn season, but the primary visual difference of fall is the color of the foliage and to capture that color, one must go outside.
While that tip might sound simple, it is easy to sit in front of a computer or TV instead of making the effort to go out. You can DVR the football game to be watched later. Darkness comes earlier in the fall, so you have some time to catch up on the game or what is going on in the photography world after the light is gone. You can catch up on your post-processing backlog in the winter (what I'm telling myself).
A great fall location is Ricketts Glen State Park, near Benton, PA. With 22 named waterfalls in this park, along with many other photogenic woods and stream scenes, it is not hard to find wall-grade compositions. Located just below Waters Meet on the Falls Trails, Harrison Wright Falls, shown here, is one of my favorites.
Don't let the weather keep you inside. My favorite weather condition for shooting in RGSP is a light rain or immediately after any rain. The rain provides more flow in the stream, but it serves a couple of other important purposes. It keeps the other hikers and less-serious photographers out of the image (they stay home). It also makes everything in the scene wet, giving the surroundings a deep, rich color when photographed through a circular polarizer filters.
You will not capture images like this one indoors. Get out and find the colorful fall foliage. Get some exercise and breathe in the crisp air while doing so. Your body and mind will be rewarded along with your portfolio.