Welcome aboard, "Eager".
The first few, basic generalities you should learn about orchid growing are that "one size does NOT fit all," there are many ways to "skin the cat," and that "what works for one person, may not work for you."
Before someone can give reasonable advice about growing your orchid, we need to know all about your growing conditions - temperatures, humidity, light levels, window-facing directions, and now much you want to "mess with" the plants, that is, do you want to water it frequently, or do you prefer to "admire it from afar" and only do minimal work to maintain it.
About the primary cultural "truism" that many beginners don't grasp is that while the plants like moisture, even more important is allowing air to get to the root system. The rotted roots you saw were likely due to them being suffocated by too dense of a potting medium, that became saturated when watered.
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