#!/bin/sh

cd ~/tmp/trash
mkdir foo
cd foo
touch index.html #empty
git init
git add .  #staging
git commit -m "v0 file created" #commit to local repo
git branch -M main
# finish init part

# now branch part
git branch hello #new branch: now has main and hello 2 branches
git checkout hello #goto hello branch
vi index.html #modify something
touch xxx.gif # add gif to hello branch

@gaia-> git add . #staging
@gaia-> git commit -m '2nd hello' #commit
@gaia-> ls #foo.gif index.html #2 files at hello branch

@gaia-> git checkout main #goto main
@gaia-> ls #index.html only one file, since main version has NO foo.gif