Experts suggest you should have three bedding sets, and I agree. It's a good idea to have two all-season sets you can switch out and alternate between washes. They should be good quality bedding sets to last you the year, at least. Bed sheets made of bamboo or cotton are best for this as they're breathable and durable.
I also recommend having the best cooling bed sheet set for summer. You'll be grateful for having a breezy set made of linen or cool-to-the-touch eucalyptus, keeping you sweat-free even in the midst of a heatwave.
Having three bedding sets also allows you to change up the look of your bedroom. Different fabrics and colors evoke different styles. Since the bed is the focal point of the room, the style of bed sheets you choose can make all the difference.