What are the four Yoga’s and how is each one a spiritual practice in the religion of Hinduism?

What are the four Yoga’s and how is each one a spiritual practice in the religion of Hinduism?
• What are the concepts of karma, rebirth, and liberation?
• How does Buddhism differ from Hinduism? What is the ‘human condition”? What is the “problem”? What is the cause of the problem? What is the answer to the problem in each religion? What is the goal?