I really recommend this because it explains things really well and even explains difficult concepts with pictures. And since you have to write the code yourself, you can understand what it means.

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Beginners to Spring can quickly learn the entire Spring web application development process by creating examples.

Spring for Beginners - Learn Spring Boot, Web MVC, and DB Access Technology with Code

입문

초급

중급이상

자바

Java

스프링

Spring

모델 뷰 컨트롤러

스프링부트

Spring Boot

Course Introduction

Project Settings

Spring Web Development Basics

Member Management Example - Backend Development

Spring Bean and Dependency

Member Management Example - Web MVC Development

Spring DB Access Techniques