Caring for plants is a lot like cooking - everyone has their own recipe, approach and advice. What works for one may not work for another. This site and its contradictory advice is a prime example of that.
My advice (after 30 years of professional experience) for whatever it is worth, is to keep it simple, attend to basics and don't get bogged down detail or quick fixes (fertilizer). First and foremost, there has to be a good match between the available light in your home, which most folks tend to overestimate, and the plant species. If a plant requires medium or high light and you only have low light, then all the advice in the world will not help. Second, understand that the pot and soil a plant is grown in at the nursery are almost always the best match for that plant, at least initially. Inexperienced and unnecessary repotting is the single most common cause of inadvertent over-watering and plant failure.
In general, the less fussing you do with your plants, the better they will be. As for the hardiest of indoor plants, a ZZ Plant is adaptable to many light conditions and is tough to kill as long as you don't repot it and just water it weekly.
And now you can expect lots of disagreement with what I have written! So it goes.
