This means: Allah is the greatest

Notes :

1- You should raise your hands with the takbeer. Look at the picture
2- Then you should place your right arm on you left arm and place it overy our chest.
3- You should place the right arm on the back of your  left palm, wrist and forearm
4- Then you should incline your head during prayer and fix your sight towards the ground .... as  the  Prophet peace be upon him do....
5- Be careful: When you start to pray don't look at the sky because it is forbidden as the Prophet peace be upon him said :" People must refrain from looking up at the sky in prayer, or their sight will not return to them (and in one narration: or their sight will be plucked away)