Java Enterprise Edition(J2EE) Study Step by Step

First I believe that you know Java Standard Edition(SE) well. So I am trying to provide you some suggestions and tutorials for learning Java Enterprise Edition(J2EE).

So we can learn in 3 phases.
i) Basic Level
ii) Mid Level
iii) Standard Level

In Basic Level, we will learn JSP, Servlet and JSTL.
In Mid Level, we will learn Spring, Spring Boot
In Standard Level, we will do some project and learn design patterns

For Basic Level, 

we will try to give you some tutorials that may be video or website links with a full example.

1. For Servlet:

i) Full tutorial with example: https://beginnersbook.com/2013/05/servlet-tutorial/
ii) For better understanding: http://tutorials.jenkov.com/java-servlets/index.html
iii) Koushik's JSP and Servlet video: http://freevideolectures.com/Course/3312/JSPs-and-Servlets/1

2. For JSP: 

i) Full tutorial with example: https://www.guru99.com/jsp-tutorial.html
ii) Full tutorial with example: https://beginnersbook.com/jsp-tutorial-for-beginners/

3. For JSTL:

i) Full tutorial with example: https://beginnersbook.com/jsp-jstl-tutorial-jstl-functions-and-core-tags/
ii) https://www.javatpoint.com/jstl

For Mid Level:

Spring: https://www.youtube.com/watch?v=GB8k2-Egfv0&list=PLC97BDEFDCDD169D7
Spring Boot: https://www.youtube.com/watch?v=msXL2oDexqw&list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x