1-What are meditation techniques?

2-what is the IPT? 

3- some times I rest my back against the wall while meditation is this right or not?
4- when do you think I will be ready to start my special Ops?
5- is the children could learn meditation? is there a specific age for it?
6- Is the meditation better in a closed, quiet room or in an open area full of trees and under sunshine?
7- In the Special Ops If I will learn people that is their first time to meditate how I will help them to let go their thought since the first time and what the appropriate duration for meditation to them?