General statements: capacitor voltage is a measure of how much the capacitor can withstand before shorting out. Higher voltage means a more durable though possibly more expensive capacitor. Farad is a measure of the “storage capacity” of the capacitor. Since capacitors are often used in oscillating circuits, having a larger capacitor slows the oscillations as it takes more time for the capacitor to fill. So, changing the farad alters the function of the circuit. In some cases it will work fine in others it will throw things off. Lastly there is the designation as to whether a capacitor is electrolytic. If so, you have to respect the polarity of the capacitor. If they are inserted wrong, it ruins the cell. Ceramic capacitors however don’t have a polarity and can be inserted either way.