There are many tools and libraries created to solve NLP problems… but you’ll cover all the essential bases once you master a handful of them. That’s why I decided to feature the Five Python NLP libraries I’ve found to be the most useful.
But before that, you should have some basic knowledge about various components and topics of NLP
There are some well-known, top-notch mainstay resources for the theoretical depth of Natural Language Processing
Stanford Course — Natural Language Processing with Deep Learning
Deeplearning.ai Specialization — Natural Language Processing Specialization
Best book for FUNDAMENTALS (aka Bible of NLP) — Introduction to Natural Language Processing, Speech Recognition, and Computational Linguistics
Another Good reference book — Foundations of Statistical Natural Language Processing