Overview of Recommendation Systems: https://en.wikipedia.org/wiki/Recommender_system
Lecture on Content-Based-Filtering Algorithms from MIT: https://www.coursera.org/lecture/machine-learning/content-based-recommendations-uG59z
Beginners Guide to learn about Content Based Recommender Engines: https://www.analyticsvidhya.com/blog/2015/08/beginners-guide-learn-content-based-recommender-systems/
Interesting article on example of recommendation system/Macchine learning: https://robots.thoughtbot.com/recommending-blog-posts
Overview of TF-IDF https://en.wikipedia.org/wiki/Tf%E2%80%93idf
Node TF-IDF library https://github.com/NaturalNode/natural#tf-idf
Podcasts-database https://github.com/odenizgiz/Podcasts-Data/blob/master/df_popular_podcasts.csv