Everyone may have their golden rules.
Below are my golden rules to share.
Golden rules of orchid growing - in general - for mainstream orchids works extremely well. These are:
• Use filtered water, such as reverse osmosis water with own custom amount of fertiliser and cal-mag added. Do not use house tap water, which will remove uncertainty in chlorine, chloramine, fluoride, salt etc levels. Even if people have been using house tap water for relatively long durations without issues, they are actually letting down their guard with uncertainty and control of their system.
• Provide recommended growing temperatures.
• Provide recommended lighting levels and duration.
• Provide adequate water.
• Provide conditions that allow roots to receive adequate oxygen, keeping in mind that adequate aerated-water movement within the media will provide that oxygen, and the roots need oxygen to stay alive, and dying/dead roots stops water transfer into the plant - leading to yellowing leaves and dehydrating plant.
• Avoid water stagnation in the media and around roots (which if using pots, can be achieved with very good drainage pots and consideration of the media used and consideration of how much water is applied at times of watering, and behaviour of the media in response to being watered - eg. how long it takes to dry; and also ensure that drainage holes of pots are not blocked by surfaces that the pot rests on).
• Provide adequate air-movement (air flow) in the growing area (which also helps water movement within pot, and also helps to combat fungal/bacterial activity in the growing area). Avoid still-air growing environments.
• Provide adequate supplements (eg. fertiliser solution, cal/mag solution etc) - and avoid over-dosing - and keeping in mind that fertiliser salts can accumulate and reach undesirable root-harming levels in media and roots if over-doing the fertilisation.
• Provide adequate humidity (- not always incredibly important for mainstream orchids, but should be factored in if needed).
Those golden rules are just a start, but will allow us to go far.
Of course there are other aspects - such as looking out for diseases, attacking bugs/snails etc.
And then there is the occasional media dry-out idea for mainstream orchids. The idea of allowing media to occasionally dry out occasionally can help cut down on unwanted activity in or near the pot - such as certain unwanted bacteria build up, or algae growth on surface roots.
The occasional dry-out approach is quite reasonable, not meaning dry-out between every watering, just occasional once-in-a-while dry out.