Having hard time to identify feedback types
There is a clear way to differentiate between the two types of feedback (Current/Voltage). 

If you short the output (making Vout = 0), and the feedback signal goes to zero, you've got Voltage feedback (sampling the voltage). 

If you disconnect the load (making Iout = 0), and the feedback signal goes to zero, you've got Current feedback (current sampling).

If the error signal is fed back in parallel (shunt) with the input.



We have a (shunt/parallel) feedback. 

And we have series feedback if the error signal is fed back in series with the input signal