There are lots of different schools of Yoga. Do you know anything about any of them?
Nope ,you tell me
I'd be happy to inform you. Some of the most well known types include Hatha yoga and Rāja yoga. 
Lets talk about the Hatha yoga
Sure. The word "hatha" actually means "force" in Sanskrit (the language of Yoga). 
What's the techniques involved?
The term "hatha yoga" suggests a system of supplementary physical techniques and postures within a much broader concept of Yoga. 
How about the Rāja yoga.?
Rāja yoga typically refers to the goal of Yoga in Sanskrit texts, and not so much a method of attaining it.