Git tutorial for beginners

Create a new repo on github

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1. Login to github: gh auth login
2. Set global options (name & email):

git config --global user.name "<Your Name>"
git config --global user.email "<your_email@whatever.com>"

3. Create new repo & clone: gh repo create
4. Initialize a git repository: git init
5. Set default branch name: git branch -M main
6. Add a remote repository:

git remote add origin https://github.com/<your_username>/<your-repo>.git

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Upload local content to a remote repository

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1. Include updates

git add .

2. Commit changes

git commit -m "<commit message>"

3. Upload to remote repository

git push

# first commit use:
git push -u origin main

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Overwrite a commit after pushed to remote

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1. Include updates

git add .

2. Modify old commit

git commit --amend -m "<commit message>"

3. Overwrite history on the Github remote

git push -f

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Discard commit

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• Delete the most recent local commit, without discard local files changes:

git reset --soft HEAD~1

• Delete commits and discard/delete all changes in your working tree (local files & untracked files or directories:

git reset --hard origin/<branch>

# or

git reset --hard HEAD~5 # reset current branch to 5 commits ago

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Comparing/diff commits

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Compares two arbitrary commits, using commit SHA-1 hash.

Example:

https://github.com/sekedus/tamp/compare/3184ad9db2c6de28794a2ee1bab91fb805f9d826..b431a20697524f9d3a332b916748457934fdc710

or use the shortened SHA code

https://github.com/sekedus/tamp/compare/3184ad9..b431a20

Delete git tag local and remote

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# delete local tag '12345'
git tag -d 12345
  
# delete remote tag '12345' (eg, GitHub version too)
git push origin :refs/tags/12345
  
# alternative approach
git push --delete origin tagName
git tag -d tagName

Changing a GitHub repository's visibility

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GitHub Docs