Wigs or hair extensions depend on your hair condition, if a person suffers severe alopecia, its good to wear the wig, but if a person just have short hair, but hair desity is good, just want to extend the length, then its better to choose hair extensions.
they are good for particular types of customers.
and the way to install wig or extensions are also different.
you can check the tutorial for that in youtube.
By the way to find the best quality hair is the key to get a good and nice look.
WIgs can easily change your style and versatile and last for long time.