Underexpose. This is the most important tip for taking pictures of sunsets. Slightly underexposing the sunset will make the colors look more rich and defined. The entire scene will become more dramatic.
Don't put the horizon line in the middle of the photo. A good general rule is to put the horizon on the bottom third of the photo if the sunset is pretty, and on the top third of the photo if the sunset is lacklustre.
Create silhouettes in the foreground. Just speed up your shutter speed and you'll have a silhouette. The key to taking a good silhouette shot is to find a subject with fine details that will let the sun shine through it and that has a recognizable shape.
Wait for the right clouds. The ideal conditions are a partly cloudy day with spotty clouds. When the clouds are just a flat gray sheet of cloud, it will not light up as much. Wait for patchy whispy clouds.
Enhance your image using professional editing apps like Lightroom, premiere pro ,etc. I use VSCO cam which is completely free !
*if you have any other tips, let share with one another :) *