There are many applications and fields and branches of Yoga. To clear this up, it can be observed that human beings have four instruments to their disposal for enlightenment: body, mind, heart and speech.
In reality everyone uses all four instruments, because they all have a body, a heart and a mind. Although ultimately only knowledge leads to unity, the others are necessary to purify the body, mind and heart first, before real understanding can dawn.
Meditation takes on a central role in
this process; it is the penultimate step
to samadhi in the yoga-sūtras. To
prepare for meditation the mind and
heart need purification. All types of
yoga with various names are given; all
are a preparation to the ultimate aim.
The yoga-sūtras are often called Rājayoga
or ‘The Supreme method of
Yoga’. These are just names.
This needs time to get familiar with and put into practice; step by step starting with the 5 restraints and observances. Begin by simply being aware of the overall system and state which of these are already part of your daily life and which you would like to develop for your own peace of mind.