i need good head .... the one i try it is good ? for my camera safety ?
I would go with just about any other manufacture for a BH than Manfrotto, Gitzo or Bogen which are the same company. They use a quick release that is unique to their three brands. If some day you want to add an "L" bracket to your equipment you will be stuck using a generic bracket that will not fit your camera well. If you add another tripod to your bag in the future, you will have to either always switch the QR plate off you camera(s) or just go with Manfrotto again.
There is an adapter and QR clamps that you can buy to convert from Manfrotto type QR to Arca-Swiss but that will add $50-100 to the cost for the tripod and even more if you bought more plates for telephoto lenses. That's what I did. I had a Manfrotto QR plate on three telephoto lenses plus my camera and then wanted an "L" bracket. So in addition to the cost of the "L" bracket (not cheap) I had to buy the adapter, a new clamp (not cheap) and three plates for my lenses.
As for safety, the Manfrotto design is less safe in my opinion. It is harder to get the camera in and secure and must be put into the clamp in the correct direction. I also had a screw come lose inside the mechanism which led to failure and my camera fell. Luckily I had just put it in and was able to catch it on the way down. This is a known defect to Manfrotto BH's and I don't know if they ever have or ever will fix it. I fixed it with blue Loctite to the hex head screw that holds the locking mechanism together. The answer from the company was less than stellar and others have reported this in reviews of Manfrotto BH's.
A QR plate is attached to the base of your camera and allows you to quickly remove your camera. There are for the most part two standards, Arca-Swiss and Manfrotto's. Though even Manfrotto uses several types within its products.
An "L" bracket allows you to switch the camera from landscape mode to portrait mode fast and keeps the camera in the same perspective. It is very useful in studio, landscape and panorama photography.
If you go with Manfrotto and stay with photography, someday you will say to yourself, "why didn't I listen to this guy and get an Arca-Swiss compatible ball head".
Sorry this is so long again, but if you don't understand because of language barrier and or just being new to photography, understand this one piece of advice: Get an Arca-Swiss compatible ball head.
and you won't regret it later.