What Are Graded Coins and Why Do They Matter?

I was gifted this 1899 20$ Liberty coin and have a question. Should I get it graded and in protective casting or is it too scrtched to make a difference. It was

What Are Graded Coins and Why Do They Matter?

What you need to know about grading coins

Pros, cons of graded modern world coins

Sheldon coin grading scale - Wikipedia

Are Graded Coins Worth More? - Blog

What Are Graded Coins and Why Do They Matter?

Question about grade: How can a coin be EF 40 and AU details at the same time? I thought AU was higher than EF. : r/coins

Worst Question) Is This Worth A Grade? : r/coins

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Understanding Coin Grading And What It All Means - The Patriotic Mint Coins