I had a vague idea about GitHub, but I feel like I learned something systematic... It was really helpful. I listened to a good lecture...

gangsugi5753

This is a lecture on the book [Everyone's Git & GitHub] published by Gilbut Publishing. It contains only the essentials of version control using Git and GitHub. 
You will learn how to use Git, which can be considered a developer's essential knowledge, without commands and how to use GitHub proficiently.

kangminchul

Git & GitHub for Everyone

입문

초급

중급이상

깃헙

GitHub

Preparing

Getting started with Git version control

Playing with versions

Managing Branches

Collaborating with GitHub

Git Command Line