Good day.

Capacitors in series gain distance between plates and lose capacitance and so is the calculation, C total= 1/C1+ 1/C2?

And in parallel increase plate area so, C total= C1 + C2?

In micro farads.

Almost right.

For series 1/C

_{Total}=1/C

_{1}+1/C

_{2}Parallel is correct

This works for any units of Farads, milli, micro, pico, just keep them all the same.

Just a note, for series capacitors it is not really correct to say the plates gain distance and lose capacitance, it is the charge on the plates and the potential difference which are the significant factor.

I'll leave you to work that through.