How can one seperate the negative feedback types one from another?
No - I don`t think that your question is "silly". It is, indeed, in some cases not easy to identify the type of feedback. At first, you have to find out which output quantity (current or voltage) determines the feedback signal. And secondly, it is important if this feedback signal is a current or a voltage.

In most cases, it is not a problem to answer the first question (output quantity).
For answering the second question (feedback quantity) it is best to find out how the feedback signal is combined with the input signal. This can be best explained using an example (opamp with feedback):

1.) For the inverting opamp amplifier the input signal is combined with the feedback signal in a common node (directly at the inv. input terminal). In such a node only two CURRENTS can be superimposed. Hence, we have voltage-controlled current feedback. This case can be transferred to a BJT amplifier, which has a feedback resistor from the collector node to the base node. In this case, signal feedback is established because the input signal is connected via a series resistor to the base node.

2.) For a non-inverting opamp amplifier the input VOLTAGE is directly superimposed with the feeedback signal using the differential input of the opamp. Hence, the voltage difference directly results from the feedback voltage. In this case, we have voltage-controlled voltage feedback. A similar case exists for a BJT amplifier (common emitter configuration) which has an emitter resistor RE. Here, the driving voltage difference Vbe directly results from the difference input voltage minus feedback voltage (developed across RE).  



In some cases, it might be helpful to look at the input resistance. In most cases, it is not a problem to see if the feedback path causes an increase or a decrease of the input impedance. In the first case (increase) we have voltage feedback and in the second case (decrease) we have current feedback.