Capacitors in a parallel alignment
This is the easier of the two to calculate, the total capacitance is simply the sum of both of the capacitors.
Capacitors in a series alignment
When calculating capacitance in series, it’s a little more complicated. But so long as you follow the formula, it should be okay. In addition to this, you can double check your results, because it should always be lower than the value smallest capacitor in the series.