I think it will be memorable because it is a practice-oriented lecture.

abcedfg

If you learned about grammar and component types in the ExtJS basic course, 
In the practical/application section, we will create a simple practice program along with server connection.

extjs

Building Web Applications with Sencha ExtJS 6 - Practical/Application

입문

초급

중급이상

스프링부트

Spring Boot

Sencha ExtJS

ExtJS

Lesson 4. Creating a client page using ExtJS components

Lesson 5. Session Interceptor Setting and Screen Processing

Lesson 6. Controlling the screen by calling the server API