JSONPath basics
https://restfulapi.net/json-jsonpath/
YAML and regular expressions
https://spacelift.io/blog/yaml
Postgres
https://youtube.com/playlist?list=PLk1kxccoEnNEtwGZW-3KAcAlhI_Guwh8x
Java Spring Boot QuickStart
https://youtube.com/playlist?list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x
Spring Framework
https://youtube.com/playlist?list=PLC97BDEFDCDD169D7
Spring Data Support
https://youtube.com/playlist?list=PL1A506B159E5BD13E
Spring Security Framework
https://youtube.com/playlist?list=PLqq-6Pq4lTTYTEooakHchTGglSvkZAjnE
Java Spring Boot Microservices Level 1
https://youtube.com/playlist?list=PLqq-6Pq4lTTZSKAFG6aCDVDP86Qx4lNas
Java Spring Boot Microservices Level 2
https://youtube.com/playlist?list=PLqq-6Pq4lTTbXZY_elyGv7IkKrfkSrX5e
Java Spring Boot Microservices Level 3
https://youtube.com/playlist?list=PLqq-6Pq4lTTaoaVoQVfRJPqvNTCjcTvJB
Java Spring and Kafka
https://youtube.com/playlist?list=PLGRDMO4rOGcNLwoack4ZiTyewUcF6y6BU
ElasticSearch https://youtu.be/gS_nHTWZEJ8