Would like more time spent on command line git and less on Github

And go slower on the command line stuff and don't clear screen so often.
Github has a nice GUI and is easy to figure out, but the command line is the difficult part that needs explanation.

该 issue 只提到了课程中关于 command-line Git 的部分以及频繁清屏的问题；没有指出任何文件、测试或课程入口。请查看 repository 的课程材料以定位这些部分，然后将更改定义为扩大 command-line 的覆盖范围、放慢节奏并减少清屏频率。

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