The lecture is decent. It's about basic level.

hjun2306049803

Spring Boot development method using Kotlin taught by a professional developer!!
Learn simple grammar and stable web application development method using Spring Boot.

steveye

Spring Boot Web MVC developed with Kotlin

steve

입문

초급

중급이상

스프링부트

Spring Boot

RESTful API

REST API

제이유닛

JUnit

모델 뷰 컨트롤러

About

Introduction to Spring Boot

Introduction to Web

REST-API

Spring Boot Validation

Exception Handling

Hands-on!! Making a TODO LIST WebApplication