Correct fit is very important. Wear cotton socks without seams. Change socks often if you have sweaty feet. Avoid knee highs and tight elastic. Cotton socks absorb moisture, keeping feet dry.
Tight spots can block blood flow.
Don't soak them. Dry them carefully, especially between toes and around nails. Dirty or damp feet are more likely to develop fungus infections, like athlete's foot. Soaking removes natural oils which can lead to dryness and cracking. Check you feet carefully.