The single most important thing is a fast shutter speed and tripod.
That is the two most important things are a fast shutter speed, tripod and reorienting.
That is the three most important things are a fast shutter speed, tripod, reorienting, and taking multiple shots.
That is the four most important things are a fast shutter speed, tripod, reorienting, taking multiple shots and taking dark frames.
That is the five most important things are a fast shutter speed, tripod, reorienting, taking multiple shots, taking dark frames and stacking software,
Sheesh...I wasn't expecting the Spanish Inquisition.
Yes I've dabbled. You can do all sorts of things with the minimum of equipment these days but with your camera on a £250 tracker - well the sky is literally the limit.
Andromeda Galaxy and Orion Nebula.