1. 创建本地项目
各人根据实际情况创建自己的项目（我在IntelliJ IDEA中创建了SpringBoot项目）
2. 在GitHub上创建仓库
3. 将本地项目上传到GitHub上
先cd进入创建好的本地项目的文件夹下，然后执行如下Git命令：
## 在GitHub创建仓库时没有添加README文件，先创建README.md文件
touch README.md
## Git初始化
git init
说明：当前目录执行git初始化，在当前目录中添加一个.git文件夹来存储一些git数据
## 添加所有文件到暂存区
git add *
## 将暂存区内容提交到本地仓库
git commit -m "项目本地仓库上传"
## 连接远程仓库(SSH和HTTPS方式都行)
git remote add origin git@github.com:rangdandanfei/git-use-demo.git
## 提交到远程仓库
git push -u origin master
说明：
git push 将当前分支推送至远程同名分支
git push origin [branch-name] 推送本地某分支至远程某分支
git push -u origin [branch-name] 推送本地某分支至远程某分支，并跟踪
FAQ :
1. 错误：error: failed to push some refs to 'https://github.com/rangdandanfei/git-using-demo.git'
原因：远程仓库和本地仓库不匹配，需要先合并，再push。
详细的错误信息如下：
$ git push -u origin master
To https://github.com/rangdandanfei/git-using-demo.git
! [rejected] master -> master (fetch first)
error: failed to push some refs to 'https://github.com/rangdandanfei/git-using-demo.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
解决方法：执行如下命令即可
## 先拉取(pull)远程仓库master分支代码，与本地进行合并，再将本地仓库master分支代码push到远程
git pull --rebase origin master
git push -u origin master
git pull --rebase 命令相关介绍可参考文章：https://www.cnblogs.com/kevingrace/p/5896706.html
2. 错误：git@github.com: Permission denied (publicKey). fatal: Could not read from remote respository.
原因：GitHub的SSH key不存在或者SSH key验证不通过。
详细的错误信息如下：
$ git push -u origin master
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
解决方法：
<1> SSH key不存在，则新建一个SSH key加入GitHub中。
命令总结如下：
-
打开Git Bash，先检查是否已经存在SSH keys，输入如下命令：
ls -al ~/.ssh 说明： 默认的公钥名为： id_dsa.pub id_ecdsa.pub id_ed25519.pub id_rsa.pub检查是否存在SSH keys -
若不存在SSH key，生成一个新的SSH key，输入如下命令：
ssh-keygen -t rsa -b 4096 -c "your_email@example.com"生成了一个新的SSH key :
> Generating public/private rsa key pair. -
当提示"Enter a file in which to save the key." 按Enter，保存到默认的文件位置：
> Enter a file in which to save the key (/c/Users/you/.ssh/id_rsa):[Press enter] -
提示输入安全密码，可以直接按回车Enter键
> Enter passphrase (empty for no passphrase): [Type a passphrase] > Enter same passphrase again: [Type passphrase again] -
把SSH key复制到剪贴板
$ clip < ~/.ssh/id_rsa.pub # Copies the contents of the id_rsa.pub file to your clipboard也可以打开C:/Users/you/.ssh/id_rsa文件，直接复制。
-
把SSH key加入到GitHub账户上
生成SSH key并添加到GitHub上
GitHub上有详细的教程，照着一步一步做就OK了，地址：https://help.github.com/articles/connecting-to-github-with-ssh/
<2> SSH key存在时，检测SSH连接和使用情况，尝试切换以HTTPS的方式连接远程仓库，若还是不行，则新建一个SSH key。
打开Git Bash，检测SSH连接情况，输入如下命令：
ssh -T git@github.com
若得到如下提示：
> The authenticity of host 'github.com (IP ADDRESS)' can't be established. > RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48. > Are you sure you want to continue connecting (yes/no)? 或者 > The authenticity of host 'github.com (IP ADDRESS)' can't be established. > RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8. > Are you sure you want to continue connecting (yes/no)?输入yes，则看到如下提示，表示SSH连接验证成功
> Hi username! You've successfully authenticated, but GitHub does not > provide shell access.
若得到如下提示：
$ ssh -T git@github.com > git@github.com: Permission denied (publickey).则在(3. 将本地项目上传到GitHub上)连接远程仓库时，尝试切换以HTTPS的方式连接。
## 连接远程仓库(HTTPS方式) git remote add origin https://github.com/rangdandanfei/git-use-demo.git若提示错误信息：
fatal: remote origin already exists.则 :# 先输入 git remote rm origin # 再输入 git remote add origin https://github.com/rangdandanfei/git-use-demo.git
检测SSH key的使用情况，输入如下命令：
$ ssh -vT git@github.com
> ...
> debug1: identity file /Users/you/.ssh/id_rsa type -1
> debug1: identity file /Users/you/.ssh/id_rsa-cert type -1
> debug1: identity file /Users/you/.ssh/id_dsa type -1
> debug1: identity file /Users/you/.ssh/id_dsa-cert type -1
> ...
> debug1: Authentications that can continue: publickey
> debug1: Next authentication method: publickey
> debug1: Trying private key: /Users/you/.ssh/id_rsa
> debug1: Trying private key: /Users/you/.ssh/id_dsa
> debug1: No more authentication methods to try.
> Permission denied (publickey).
或提示：
$ ssh -vT git@github.com
> ...
> debug1: identity file /Users/you/.ssh/id_rsa type 1
> ...
> debug1: Authentications that can continue: publickey
> debug1: Next authentication method: publickey
> debug1: Offering RSA public key: /Users/you/.ssh/id_rsa
扩展阅读：
GIT——新建项目并提交远程仓库: https://blog.csdn.net/qq_37049781/article/details/81873353
本地项目提交到GitHub: https://www.jianshu.com/p/4f3151195ef0
