Merge branch 'main' into 'main'

So far it was easy to understand.

I also like the homework you give us because I can try using git at home.

1999  cd pv177/mastering-git-pv-177/

 2000  ls

 2001  git pull

 2002  ls

 2003  git branch

 2004  git switch main

 2005  ls

 2006  git pull

 2007  ls

 2008  cd class3_homework/

 2009  touch 536589.txt

 2010  ls

 2011  \vi 536589.txt

 2012  vi 536589.txt

 2013  git status

 2014  git add .

 2015  git status

 2016  git commit -m "class 3 homework start"

 2017  git branch

 2018  git push

 2019  history