How do I check the value of a silver dollar coin?

Could you please elaborate on the steps one should take to determine the monetary worth of a silver dollar coin? Is there a specific online resource or application that is commonly used for this purpose? Also, are there any factors that might affect the value of the coin beyond its metal content, such as its rarity or condition? Finally, what precautions should be taken when assessing the authenticity of a silver dollar coin to ensure an accurate valuation?