I want to know about ninjas

To become a ninja you need to train in various martial arts, especially ninjutsu. You need to become a master of stealth, fighting, espionage, etc. Ninjas should be able to use anything as a weapon, but normal tools include shruiken, katanas, staffs, nunchucks...personally, I prefer bo staffs and daggers, but that's just me. And yes people still practice the way of the ninja. Not so much as a war and spying art anymore, but as a sport, an art, and a lifestyle. I'm training in karate, but I do weapons and pressure point work on the side.