There are different paths to reach the top of a mountain. You choose one depending on your situation and character. You could use a car, motorbike, or funicular or walk and even jump from a helicopter. Your goal is to reach the top, which is the same for everyone, regardless of the path, means, or how many days it took to reach the top. It is the same in yoga. There are many paths, but the ultimate goal is the same: to be a better, healthier, and happier human being, and to reach perfection, Samadhi, Moksha…
Yoga is a way of life, a system built for the body, the mind, and the energy-spirit. This art of living was perfected and practiced in India thousands of years ago. Yoga is a science of universal truth and its teachings are as valid today as they were in ancient times. The goal is to discover your true nature, improve yourself and connect with the Universe. Depending on your temperament, character, or personality, you are attracted to this or that branch of yoga. For example, a person with an intellectual nature could be attracted to the practice of Jnana Yoga and one very devotional to Bhakti Yoga.
There are four traditional schools of yoga: Raja Yoga, Karma Yoga, Bhakti Yoga, and Jnana Yoga. Raja Yoga has many ramifications, which I also describe in this section. The vast majority of yoga practitioners practice a combination of several branches. You practice the one that is most suited to your nature.
It needs to be clarified that although yoga developed in India and many of its elements coincide with Hinduism and Buddhism, they also coincide with all religions and none at the same time. You could be Christian, Buddhist, Muslim, Jewish, agnostic, pagan, or atheist and practice yoga. Yoga is not affiliated to any religion.