There are a lot of different styles and intensity levels. The appropriate one for you is a combination of personal preference and your level of physical fitness.
For an absolute beginner, where I have no idea what level of fitness you have or what injuries you may be working with, I would recommend Iyengar. It is relatively gentle, and emphasizes careful development. A lot of people like Vinyasa, which can range from slow and gentle to as aerobic as running. I like Ashtanga, which is about doing the same set of poses every time, but doing them correctly. I wouldn't recommend it for absolute beginners, however.
Obviously, don't run out and do crazy stuff like headstands or intense backbends or balancing poses unless you have experience. But also be aware that even "normal" yoga can have positions that are risky for people when done incorrectly -- for example, men typically have tight hamstrings and hips, and compensate in forward folds by bending over from the lower back. This can be dangerous if you don't have a strong back (and it's never a good idea). It is helpful to have 1:1 instruction if you don't know the form.
If you want someone who I know is a good instructor and willing to teach via video, please backchannel me and I can recommend.
For an absolute beginner, where I have no idea what level of fitness you have or what injuries you may be working with, I would recommend Iyengar. It is relatively gentle, and emphasizes careful development. A lot of people like Vinyasa, which can range from slow and gentle to as aerobic as running. I like Ashtanga, which is about doing the same set of poses every time, but doing them correctly. I wouldn't recommend it for absolute beginners, however.
Obviously, don't run out and do crazy stuff like headstands or intense backbends or balancing poses unless you have experience. But also be aware that even "normal" yoga can have positions that are risky for people when done incorrectly -- for example, men typically have tight hamstrings and hips, and compensate in forward folds by bending over from the lower back. This can be dangerous if you don't have a strong back (and it's never a good idea). It is helpful to have 1:1 instruction if you don't know the form.
If you want someone who I know is a good instructor and willing to teach via video, please backchannel me and I can recommend.