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There are many text mining learning resources available on the web. Below is a list of videos, books, and articles that can help you learn the various text mining techniques outlined in this guide.
Text Mining with R: A tidy approach -- This book by Julia Silge, the creator of the tidytext R package, offers a plethora of examples and background information for a deeper dive into topics like Topic Modeling using Latent Dirichlet Allocation and sentiment analysis.