Temperature coefficient:

Some of the capacitors increase in their value as the temperature rise. These components have positive temperature  coefficient. Some capacitors' values becomes less as the temperature rises; these have negative temperature coefficient. Some of the capacitors are manufactured so that their values remain constant over a certain temperature range. Within this span of temperatures, such type of capacitors has zero temperature coefficient.

The temperature coefficient can be specified in percent per degree Celsius.

At times, a capacitor having a negative temperature coefficient can be connected in series or parallel with the capacitor which is having a positive temperature coefficient, and the 2 opposite effects will cancel each other out over the range of temperatures.  In other example, a capacitor having a positive or negative temperature coefficient can be used to cancel the effect of temperature on the other components in the circuit, like inductors and resistors.

You will not have to do calculations including temperature coefficients if you are in the management position; you can delegate these things to engineers. If you plan to become engineer, you will likely have computer software which will do the calculations for you.