After taking the introductory course and then listening to this, it's truly... perfect.
I've been a "Spring quitter" for years, but Teacher Young-han Kim is just perfect for saving me ㅠㅠ

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Spring beginners can grasp core principles and solidify basics via examples.

Spring Core Principles - Basic Edition

입문

초급

중급이상

스프링

Spring

객체지향 프로그래밍(Object-Oriented Programming, OOP)

Course Introduction

Object-Oriented Design and Spring

Understanding Spring Core Principles 1 - Creating Examples

Understanding Spring Core Principles 2 - Applying Object-Oriented Principles

Spring Container and Spring Bean

Singleton Container

Component Scan

Auto-injection

Bean lifecycle callback

Empty scope