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From what I learned, the article has some bad tips and is overly verbose...

Do NOT let your plant sit in water over night. You need a good soil mix, which does not compress and regulates moisture. Water plenty, true, but dispose the water collected underneath the pot. Plants rely on flushing out excess salts and so on with rain (which is also why artificial watering will ruin soils in agriculture over time). Letting them sit long in the soup will disable this process and overtime the soil will kill the plant, e.g. starting with yellow-brown leaf tips.

Just put a finger in the soil to check humidity. Water when two thirds feel dry. works for most plants.

The hard part about watering plants is the "not every day; not rarely" schedule. A 3-4 days period is just shit for forming a habit.

As others have said, e.g. a dramatic plant like a Peace Lily can remind you to care for your plants. But use the finger to check the other plants to make sure they are dry enough.

Or get a snake plant (Beamtenspargel). They are really hard to kill.