This plant has more than a dozen species and all are very diverse in shape, colour, and texture. Green/purple leafed peperomias need to be in a space that gets a decent amount of indirect sunlight. As for variegated peperomia, they like a few hours of direct sunshine each day. So therefore these plants should be placed close to a window.
The easiest way to kill these plants is to over water them. Ensure you let the soil dry almost completly between waterings… The thick fleshy leaf stems of the peperomia allow it to withstand large amount of time without water.
NOTE: Since there is no drainage there's a thin layer of pumice as the bottom to stop root rot. Its important to not over water.