Applying Natural Language Processing to Unstructured Data

"Act as a data analysis expert specializing in Natural Language Processing (NLP). I have unstructured text data that needs to be analyzed for extracting meaningful insights. Provide a comprehensive step-by-step guide to applying NLP techniques, including data preprocessing, sentiment analysis, entity recognition, and topic modeling. Explain how to summarize the findings and present them using visual aids such as charts or graphs. Suggest tools, libraries, and best practices to achieve this, and advise on how to interpret the results for non-technical stakeholders. Ensure the explanation is clear, concise, and tailored to someone with an intermediate understanding of data analysis."