Basic techniques: https://nlp.stanford.edu/IR-book/information-retrieval-book.html https://nlp.stanford.edu/IR-book/information-retrieval-book.... Smartness (N

Basic techniques: https://nlp.stanford.edu/IR-book/information-retrieval-book.html https://nlp.stanford.edu/IR-book/information-retrieval-book.... Smartness (NLP): https://web.stanford.edu/~jurafsky/slp3/ https://web.stanford.edu/~jurafsky/slp3/ There are also newer techniques, like "deep learning" for search. Not sure what's a good resource for that (using ML to learn the scoring functions is more than a decade old field (learning to rank), it just surfaced again because of the new ML techniques). Check the table of contents of those books. Courses which mention chapters or sections from them are probably a good choice. You can also check Apache Lucene and do a deep dive to see state-of-the-art implementation (Lucene in Action is a good introduction).