Inversions are a tremendously valuable part of hatha yoga, and they can generally be modified so that they are appropriate for beginners. They can also be challenging for beginners who are still developing the necessary strength and flexibility to practice them safely. It is important to have a good understanding of correct alignment in these postures, so that you can practice them with integrity and without injury.
It is helpful to use props and/or a wall to modify many inversions. Remember that relying on props or a wall is not "cheating" but is instead making use of a terrific teaching tool that can protect and support your body as it learns these important postures.