machine learning

 https://spacy.io/usage/spacy-101

https://scikit-learn.org/stable/install.html

Redis template

 https://www.tabnine.com/code/java/methods/org.springframework.data.redis.core.RedisTemplate/opsForSet

Exception handling ways in springboot

 https://springframework.guru/exception-handling-in-spring-boot-rest-api/