What type of socks to wear?

Let me clarify: I'm in the middle of upgrading my wardrobe. Infact overhaul is a better word. I have never given thought to my socks. Earlier I used to wear invisible socks with sneakers. And longer formal ones with suits. And lately, I've been wearing woolen socks in winter while ankle length in summers. I was wondering if there's any recommendation with regards to material, length, and colors (to buy and to avoid). Kindly guide. Sorry for the n00b question.
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