The circuit 1 is the most basic circuit.

To move foward we need to do this code 

motor (all) move (foward) at speed (100

To turn right ot left we need this code.

If we want it to turn  it right use this code.

If we want it to turn it left we need to make the code to be  

motor right move backwards speed 50

and

motor left move fowards speed  50