https://gitlearn.takushio2525.com/ https://gitlearn.takushio2525.com/chapters/01-first-repository/ https://gitlearn.takushio2525.com/chapters/02-connect-your-pc/ https://gitlearn.takushio2525.com/chapters/03-record-changes/ https://gitlearn.takushio2525.com/chapters/04-push/ https://gitlearn.takushio2525.com/chapters/05-branch/ https://gitlearn.takushio2525.com/chapters/06-pull-request/ https://gitlearn.takushio2525.com/chapters/07-stay-in-sync/