Is krav maga good to know how to fight abd defend yourself? I been thinking to do krav maga?

No not realy

Krav Maga is a good fighting system to learn to defend yourself with (if you can find a legit instructor and not a fake). Krav doesn't teach "budo" concepts like how to use it to better yourself as a person or the Mr. Miyagi "learn to fight so you never have to fight." Krav is direct and to the point. You will learn to defend yourself and potentially inflict serious damage on your attacker. However in all fairness Krav Maga isn't the be all end all of learning to fight either.

You should know Krav Maga doesnt achieve anything and niether does Kajukenbo its just an activity to be disciplined if you can function like an normal person because of idiot black belts

Krav-maga is very dangerous dicipline. It is not a sport. Gauging the eyes at street would cause you to go jail. Boxing, kickboxing or muaythai would be your solution.

Not really. It is considered cross fit of martial arts, great for soccer moms and people who want to walk around with a chip on their shoulder.

Yes that seems to be correct