How many ways can a guy orgasm and how?

Technically, a male only orgasms one way - he experiences a climax and sperm is ejaculated from his penis.

If, however, you are asking about ways to make this happen, there are tons of different things you can try. Use some hand lotion or body wash for better feeling on your penis, use an electric toothbrush or similar and rub it on your penis while it's buzzing, put a pillow between your legs and move up and down on that. There are a huge number of ways to enjoy masturbation!