From August 13, 2021, Github is no longer accepting account passwords when authenticating Git operations. You need to add PAT (Personal Access Token) instead, you can follow the below method to add PFA on your system
Create Personal Access Token on Github
From your Github account, go to Settings => Developer Settings => Personal Access Token => Generate New Token (Give your password) => Fillup the form => click Generate token => Copy the generated Token, it will be something like ghp_sFhFsSHhTzMDreGRLjmks4Tzuzgthdvfsrta
For Linux based OS ⤴
For Linux, You need to configure the local GIT client with a username and email address,
$ git config --global user.name "your_github_username"
$ git config --global user.email "your_github_email"
$ git config -l
Once GIT is configured, we can begin using it to access GitHub. Example :
$ git clone https://github.com/YOUR-USERNAME/YOUR-REPOSITORY
> Cloning into `Spoon-Knife`...
$ Username for 'https://github.com' : username
$ Password for 'https://github.com' : give your personal access token here
Now cache the given record in your computer to remembers the token :
$ git config --global credential.helper cache
If needed, anytime you can delete the cache record by :
$ git config --global --unset credential.helper
$ git config --system --unset credential.helper
Now try to pull with -v to verify
$ git pull -v
If already configured previously then need to use token instead of password