I like this site...
http://www.learnabout-electronics.org/
And here is the start of the FET section.
http://www.learnabout-electronics.org/fet_01.php

 

Note that pot RV1 is incorrectly connected.
It should be connected between the cathode of D1 and the anode of D2 with the pot wiper connected to pin 2 and pin 6, so that it can adjust the duty-cycle of the square-wave output from the 555.

If you got that 555 circuit from the internet, you miscopied it.

 

Note that pot RV1 is incorrectly connected.
It should be connected between the cathode of D1 and the anode of D2 with the pot wiper connected to pin 2 and pin 6, so that it can adjust the duty-cycle of the square-wave output from the 555.

If you got that 555 circuit from the internet, you miscopied it.

RV2 for the duty cycle and RV1 for the frequency as I read in the description of the circuit

 

RV1 for the frequency as I read in the description

Okay, I see that now.
But that's an unusual place to put a frequency adjusting pot for a 555 as it also affects the trigger point and, at some adjustment frequency the 555 may cease to operate, but it should work over a limited range.

 

the last thing I want if there is a book about FETs and how to practically deal with them I'll be sooo pleased

http://www.mcmanis.com/chuck/robotics/projects/esc2/FET-power.html

http://www.mcmanis.com/chuck/robotics/tutorial/h-bridge/

 

http://www.mcmanis.com/chuck/robotics/projects/esc2/FET-power.html

http://www.mcmanis.com/chuck/robotics/tutorial/h-bridge/

thank you veryyyyy much