git常用知识总结

 参考资料：

1. https://blog.csdn.net/lqlqlq007/article/details/78983879
2. https://acuity.blog.csdn.net/article/details/79524363 
3. https://blog.csdn.net/qq_18863573/article/details/97893654
4. https://www.jianshu.com/p/c0f7e4ac14c7