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I used to be notorious for my brown thumb. Each time I brought a new plant home, Eric would play "guess how long before Jo kills this one."
Years of trial and error have resulted in a kind of survival-of-the-fittest plant situation in our home.
I've found my greatest pitfall has been not adhering to each individual plant baby's light and water requirements, trying to apply a one-size-fits-all approach to all of our plants.
For the houseplants I've managed to keep alive, the key has been:
1. Placing each plant in a location with the right amount of light for that plant. If it doesn't come with instructions, Google it.