1. tip of your current branch is behind

hint: Updates were rejected because the tip of your current branch is behind

hint: its remote counterpart. Integrate the remote changes (e.g.

hint: 'git pull ...') before pushing again.

hint: See the 'Note about fast-forwards' in 'git push --help' for details.

발생 이유 : 누군가 브랜치를 바꿨거나, 최종 커밋한 것을 반영 못해줘서

해결 방법 : git push -d origin feature/feature-specific

• 에러 해결 단계
• 이유