Singing is the great dream of most of the people I know, singing like all professionals and for a long time we have tried but without any instruction, coming to make mistakes that are harmful to our throat and voice. Look what are the most common mistakes:
1)Do not Shout: In the song it is not necessary to shout to reach the highest note, you only have to use the appropriate vocal technique to reach that dreamed note. Quite often we make this kind of mistake when we sing, we want to reach that high note desperately and we want to do it anyway, even shouting. But this makes the song heard forced and very bad, a part that can bring health consequences to our vocal cords.
2)Red Faces: Faces reddened in singers are very common. This is due to several factors, one of them is a flaw (error or lack) of technique, because when it is necessary to raise the tone to a level close to the limit of the singer or higher "Never" you have to make force by overstressing your throat.
3)Out of tune: Give a higher or lower note than corresponds at any given time, when singing or playing an instrument. This is a mistake that is made with great frequency, it is sung in a different tone to the tone that is being played on the instrument, either a lower or higher tone, which makes the difference and sounds horribly out of tune, outside of place. Example: the song is in SOL and the person sings it in Re. Displeasing the listener's ear.
If your dream is to sing like a professional, take the time to learn the right techniques, and to train your ear so you can sing wherever you want and be pleasing to the audience that hears you.