Basic microphone technique is not difficult, but may require a little practice to get just right. Hear are some useful hints and tips.
For normal singing you can be quite close to the microphone, but for louder parts of a song, or any words suddenly sung with more force, move the microphone away from your mouth. Also, for any words with a plosive, or ‘p’ sound, move the microphone a little further from the mouth. Watch professional singers to see how they do it. Using this simple technique will make a big difference to your performance; your voice will blend much better with your backing.
Something also worth being aware of is that if you sing very close to the microphone there will be an increase in bass response. This is known as the 'proximity effect', and is a natural characteristic of unidirectional microphones.
Microphones will pick up handling noise as well as vocal sounds, some more than others, so it's best to keep a firm grip, and avoid moving your hand around too much on the body of the microphone.
And one final point: don't tread on the microphone cable! Treading on the cable can cause damage to the wires inside, resulting in a degradation or complete loss of signal. Also, good quality microphone cable is not cheap. Look after it and it won't let you down in the middle of a song.