Summarize this article in one sentence.
Fishing is partly a game of chance, but where you choose to fish can make a big difference in the outcome of your expedition. It's best to choose a quiet, secluded place far from other people (including other fishers). You'll also have to read the water to find the best places to cast, as fish tend to gravitate towards certain underwater environments. Look for boulders and submerged trees/debris. Fish tend to use these underwater areas for shelter/protection, as well as for feeding. Scan the water for any areas just downstream of rocks and trees. Fish commonly position themselves just past these refuge areas knowing that smaller fish and aquatic invertebrates will travel downstream. In the early morning hours you might be able to find fish in unusually shallow water as they search for food. Stand on the bank and scan the shallows for signs of fish. Try casting in undercut banks. If the water has worn out a channel under the bank of the river and created a hollowed-out space, it's a good bet that fish congregate there. Look for pools where the stream/river widens to a gut. The head of the pool (where the pool first widens) is usually a good fishing spot, as well as the slower current just downstream of the head. Avoid casting in the downstream end of a pool (called the tailout). That area tends to be more shallow and near rapids/riffles downstream, so most fish tend to avoid these areas. Almost as important as where you fish is when you fish. Fish tend to feed in the morning around sunrise, and again in the evening around sunset. However, if you're new to fishing, it may be easiest to learn how to fish in the midday sun. If you're just starting to learn how to fly fish, you may not know how to spot a fish on the bed or a river. You'll be able to see a fish's shadows most clearly during midday due to the position of the sun and the reduction of glare on the water. If you're just starting out, it may be best to practice spotting fish and casting during the midday sun. You can always stick around until fish become more active, or come back at a later time. Fish are incredibly sensitive to their environment. Any kind of noise can disturb fish, though other factors may also tip them off to your whereabouts. Fish can detect disturbances in the water. Some may even be able to detect disturbances along the shore. Never stomp your feet or make a lot of noise on the banks. Stay in the shade so you don't cast a shadow, or try crouching/squatting as you approach the water. If you intend to wade into the water, move very, very slowly. Walking in too rapidly will create ripples and send the sound through the water column.

Summary:
Choose a good fly fishing location. Fish at the right time of day. Be quiet and cautious as you approach/enter the stream.