Describes the cause and action for error messages.
Error Message(English)：
cannot push to github authentication failed
Cannot push to github at any repository
https://stackoverflow.com/questions/21534670/cannot-push-to-github-at-any-repository
Github - Fatal Authentication Failed - Yet I can still connect ...
https://stackoverflow.com/questions/19351448/github-fatal-authentication-failed-yet-i-can-still-conn・・・
GitHub: invalid username or password
https://stackoverflow.com/questions/29297154/github-invalid-username-or-password
Cannot push to github repo
https://stackoverflow.com/questions/5486143/cannot-push-to-github-repo
githubを二段階認証に変更後に起こるエラーの対処方法 - Qiita
https://qiita.com/sayama0402/items/670b6b650ebdd8680a0b
[初心者]GitHub にてpushができなかった話とその解決（2段階認証） - Qiita
https://qiita.com/matsuhei/items/554be988ce5deabc2510
GitHub Error: Authentication Failed from the Command Line - Medium
https://medium.com/@ginnyfahs/github-error-authentication-failed-from-command-line-3a545bfd0ca8
GitHubの2段階認証を有効にした状態で、repositoryの操作をコマンド ...
https://gist.github.com/ytsuboi/a5b292c35ae0250d99f6caa5c9e02225
I can't connect to my own repository. Push origin ・ Issue ... - GitHub
https://github.com/desktop/desktop/issues/4013