When you value something, you consider it important and worthwhile. For example, if you value someone’s opinion, you will ask that person's advice before making a big decision.
Value has to do with how much something is worth, either in terms of cash or importance. As a verb, it means "holding something in high regard," (like "I value our friendship") but it can also mean "determine how much something is worth," like a prize valued at $200. The noun value also relates to worth, like a used car that is a good value, the value of good health, or the ideals we have, like "My values include honesty and fairness."