The "easiest" kind of plant to take care would be the one that requires less maintenance. The kind that requires less effort, less monitoring and less attention.
Remember when we said plants depend on Light, Water, Air, Temperature and Nutrients to survive? Unfortunately, i cannot say that any plant in this world can live with neither of these. However, we can pick plants which are more tolerant to less of these essentials.
This is also tricky, because it depends on where are you placing your plants. Please bear in mind that low care doesn't mean no care. Plants are pets too!
If your plant can tolerate less shade, then you don't need to care too much if there's not enough sunlight coming in from your balcony.
If your plant can tolerate less water, then you don't need to water so often.
If your plant can grow well without being fertilized, then you don't need to fertilize so often.
Simple hor? All you gotta do is know and understand your plant!
Here is a short list of easy outdoor plants:
Aloe vera
Bougainvillea
Ficus sp.
Heliconia psittacorum
Cactuses
Generally putting them outdoor and saying that it's "easy" to take care means it doesn't die that easily if you don't water them as often. However because they are outdoor plants, they still require a decent amount of sunlight!
This is a short list of more common indoor plants:
Epipremnum aureum (money plant)
Dracena fragrans (iron plant)
Philodendron scandens
Sansevieria trifasciata (snake plant)
Zamioculcas zamiifolia (ZZ plant)
Check out why the location of your plant matters here!
A list of more common edible plants:
Pandanus amaryllifolius (Pandan)
Passiflora edulis (Passion fruit)
Plectranthus amboinicus (Indian borage)
Aloe vera
Citrus × limon (lemon)
ANW i said easy to plant means won't die so easily. I didn't say easy to flower or fruit ah. Anything that requires flower or fruit will require extra care :)
If you don't know wtf i'm saying with all these plant names, you can google for pictures. I'm sure you've seen them before somewhere somehow. Because they are so commonly used for their easy maintenance haha. Select the text, right click and search google for "<whatever you selected>".