thank you in advance please answer below questions:
1- what is your software ? is it industrial ?
It is Falstad's interactive animated simulator.
www.falstad.com/circuit
Uses 'generic' components only. Easy to lay out a schematic. Shows current bundles travelling through wires.
It can show several scope traces, although they are not such high resolution as you would see in simulators commonly used in professional circles.
2- what do you mean H-bridge ? do you have any documentation or tutorial to teach me step by step ?
H-bridge describes the arrangement of the switching devices. A letter 'H'.
There are many ways to control the switching pattern. I have not seen a document which discusses them all. You will need to explore various articles and schematics.
3- Is the out put between A and B branch ? I mean do I have 6v AC between A and B ? and can support 4 ampere ?
The output is the resistor labelled 'load'.
A and B are control signals.
4- what is the transistor part number ?
You'll need two NPN's and two PNP's. Or two N-mosfets and two P-mosfets.
They must be rated to carry several amps.
5- how do you have built 60Hz frequency ? with out 555 or micro ?
You can use a 555 IC, or any pulse generator you wish, and whatever frequency suits your purpose.
The duty cycle should be 50 percent of course.
6- Is this circuit reliable and industrial ?
Yes, if you construct it with the proper components and the recommended safeguards.
My simple schematic above shows only the essential parts.