Karma Yoga - Karma Yoga is the Yoga of Action or Service to Others. It is the path chosen primarily by those of an outgoing nature. It purifies the heart by teaching you to act
selflessly, without thought of gain or reward. By detaching yourself from the fruits of your actions and offering them up to God, you learn to sublimate the ego. To achieve this, it is helpful to
keep your mind focused by repeating a mantra while engaged in any activity.
The important piece to remember is to take the action and then let go. We are responsible for the action, not the outcome - we act, Higher Power/God acts and in between is energetic, divine catalysis. We are only asked to take responsibility for acting purely - no matter which path we feel is ours.
Bhakti Yoga or Divine Devotional Love Yoga - Bhakti Yoga is said to be the easiest path to God in our current age. To fall in love and offer prayers, mantras, rituals and other activities of divine service to God/Goddess through our actions to God directly and through others.
This is the Yoga of surrender, completely offering, singing, loving and devoting oneself directly.
Jnana Yoga - The Yoga of the Intellect or Knowledge - Jnana Yoga is the most difficult road. One of the reasons is that it is exceptionally difficult to see oneself clearly, to examine the contents of own's own mind and actions fearlessly. This requires tremendous strength of will and intellect. The Jnana Yogi uses his mind to inquire into its own nature. We perceive the space inside and outside a glass as different, just as we see ourselves as separate from God.
Jnana Yoga leads the devotee to experience his unity with God directly by breaking the glass, or the ego, dissolving the veils of ignorance. Before practicing Jnana Yoga, the aspirant needs to have integrated the lessons of the other yogic paths - for without selflessness and love of God, strength of body and mind, the search for self-realization can become mere idle speculation.
Raja Yoga - Often called the "royal road" it offers a comprehensive method for controlling the waves of thought by turning our mental and physical energy into spiritual energy. Raja Yoga is also called Ahtanga Yoga referring to the eight limbs leading to absolute mental control.
The chief practice of Raja Yoga is meditation as well as yoga and other forms of activity which lead one to control one's body, energies, physical and spiritual sense and the mind. Niyamas, Bandhas, Yamas, and Mudras are all used to stimulate and control the subtle forces of Prana.
Compiled by the Sage Patanjali Maharishi in the Yoga Sutras, the Eight Limbs are a progressive series of steps or disciplines which purify the body and mind, ultimately leading the yogi to enlightenment. These 8 limbs are:
Paraphrased from the Vedas