Best product/routine for curls?

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I need to figure out how to take care of my hair! I have realized that I have never been taught how to take care of my curls, and my hair is suffering of 25 years of damage. I need to know what in your opinion is the best products, and how do you take care of your curls? I really can't identify what type of curls I even have! I just really want to learn to take care of my hair!