Repository from command line:

https://gist.github.com/alexpchin/dc91e723d4db5018fef8

https://help.github.com/en/github/importing-your-projects-to-github/adding-an-existing-project-to-github-using-the-command-line

curl -H 'Authorization: token my_access_token' https://api.github.com/user/repos
curl -u 'AnonTester' https://api.github.com/user/repos -d '{"name":"context.youtube.dl.menu"}'

curl -u USERNAME:PERSONAL_ACCESS_TOKEN https://api.github.com/user/repos -d '{"name":"myDirName"}' #will create the repo in github.

cd context.youtube.dl.menu/
git init
Initialised empty Git repository in /home/kodi/wuffrepo/context.youtube.dl.menu/.git/
git add .
git commit -m "initial commit v1.2.0"
git remote add origin git@github.com:AnonTester/context.youtube.dl.menu.git
git push -u origin master

eval $(ssh-agent -s)
ssh-keygen -t rsa -b 4096 -C "key comment"
## you'll be prompted to a couple of times. Press enter for the first prompt. choose a passphrase for the second prompt, or press enter twice for no passphrase
ssh-add ~/.ssh/id_rsa   #this is your private key
cat ~/.ssh/id_rsa.pub   # copy the output of this command. this is your SSH public key
curl -u USERNAME:PASSWORD https://api.github.com/user/keys -d '{"title":"KEY_NAME", "key":"YOUR_RSA_PUBLIC_KEY_HERE"}'   #the value you copied earlier and your keyname. I recommend using a combination of machine name and app (My-laptop (Git CLI)

NOTE: As a security precaution, GitHub automatically removes personal access tokens that haven't been used in a year.

https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token

1. In the upper-right corner of any page, click your profile photo, then click Settings.
2. In the left sidebar, click Developer settings.
3. In the left sidebar, click Personal access tokens.
4. Click Generate new token.
5. Give your token a descriptive name.
6. Select the scopes, or permissions, you'd like to grant this token. To use your token to access repositories from the command line, select repo.
7. Click Generate token.
8. Click to copy the token to your clipboard. For security reasons, after you navigate off the page, you will not be able to see the token again.

Warning: Treat your tokens like passwords and keep them secret. When working with the API, use tokens as environment variables instead of hardcoding them into your programs.

Once you have a token, you can enter it instead of your password when performing Git operations over HTTPS.

For example, on the command line you would enter the following:

$ git clone https://github.com/username/repo.git
Username: your_username
Password: your_token

git checkout --orphan newBranch
git add -A  # Add all files and commit them
git commit
git branch -D master  # Deletes the master branch
git branch -m master  # Rename the current branch to master
git push -f origin master  # Force push master branch to github
git gc --aggressive --prune=all     # remove the old files

#rename url on github.com if desired, then update the url:
git remote set-url origin newURL

Example fork of repo mainuser/interestingrepo to myuser/interestingrepo

git clone git@github.com:myuser/interestingrepo.git
cd interestingrepo
git remote add upstream git@github.com:mainuser/interestingrepo.git

To update:

git fetch upstream
git rebase upstream/master

git commit --amend -m "New message"
git push --force repository-name branch-name

git config credential.helper store

then:

git push http://example.com/repo.git
Username: <type your username>
Password: <type your password>

[several days later]
git push http://example.com/repo.git
[your credentials are used automatically]

Passwords stored in plain text, each on their own line in URL format:

https://user:pass@example.com

git reset --hard HEAD^
git push origin -f