Is it necessary to use a whole variety of meditation techniques?

I have been practicing samatha, vipassana and metta meditations for over a year. I came frequently across articles (and questions on this site, primarly this one ) describing other types of meditation, which can be rather confusing, because it is not often very clear what differenciate one from another, nor what is their purpose. Should I worry about all the other meditation techniques out there ? How far should one expect to go by practicing only a combination of samatha, vipassana and metta ?