Watering new species of plants is a little weird at first but overtime you form a natural intuition of when to water. The funny thing about Venus Flytraps is that although they like constantly moist soil, they can actually dry out significantly before being harmed. Depending on a variety of factors like humidity, temperature, and location, the moment when it's time to water can vary significantly. This is why people water in so many different ways.
But if that's too much to think about, here's somewhere to start. Keep a tray constantly filled with about half an inch or so of water. It can get a little wetter or a little dryer, but never let it dry out completely. Being really wet for a little is fine, but for long periods of time will cause it to not grow as well and it may succumb to root rot.
YouTube Channel: https://www.youtube.com/channel/UCP_Nin ... Rig/videos