For the circuit shown in the picture above, find the current and potential difference for each resistor.
First step is to collapse the resistors down into one equivalent resistance. In order to do so we have to start with resistors that are continuous ie. do not have branch point between them. Start with the 6 and 12 ohm resistors that are in parallel. For resistors in parallel, 1/Req=1/R1+1/R2. Then we can combine that resistance with the 4 ohm resistor. These are in series so Req=R1+R2. Now that resistor and the 8 ohm resistor are in parallel. Find the equivalent resistance between them. We now have that resistance and the 2 ohm resistor in series. Combining those gives us the equivalent resistance of the entire circuit. Now we can find the current flowing through that equivalent resistor using Ohm's Law V=IR.
From here, we can work backwards to find the voltage (aka potential difference) and current through each resistor with two facts in mind.: Resistors in series share current and resistors in parallel share voltage.
Hopefully, this is enough to get you started. If you are still stuck, please refer to our videos on resistor circuits I think you will find them helpful. Feel free to ask more questions :)