What's the fastest way to do a text analysis over user reviews on a website for a beginner?
Welcome to DS.SE, @shubham.

Since the question is a bit general, I can just provide you some link to start with. Once you have more specific requirements, the community can help further.

An easy-to-use tool that I knew for sentiment analysis was IBM Alchemy which seems retired now in favor of IBM Watson NLU.

Despite IBM, other analytical platforms such also provide sentiment analysis APIs/tools. For example, see Google AI &amp; Machine Learning Products
 and Deep AI. This article on Medium reviews some this tools in brief.