https://www.youtube.com/watch?v=WH6XJvUbxTI&list=PLuHgQVnccGMA8iwZwrGyNXCGy2LAAsTXk&index=28&t=62s ================================================================================ git init ================================================================================ vim f1.txt a git add f1.txt git commit -m "1" ================================================================================ ================================================================================ vim f1.txt git commit -am "2" ================================================================================ git branch exp git branch ================================================================================ rm .git/refs/heads/exp git branch ================================================================================ git log vim .git/refs/heads/exp ================================================================================ git branch ================================================================================ git checkout exp ================================================================================ vim f2.txt a ================================================================================ git add f2.txt git commit -m "3" ================================================================================ git checkout master ================================================================================ git log --branches --decorate --graph