GitHub is no longer accepting account passwords when authenticating Git operations. You need to add a PAT (Personal Access Token) instead, and you can follow the below method to add a PAT on your system.
Steps
Go your Github account, click on settings >> Developers settings >> Personal Access Token >> Tokens(classic) >> Generate New Token >> Give password >> Fillup the form >> Click on Generate Token >>** Copy the Generated Token**. It will be something like ghp_sFhFsSHhTzMDreGRLjmks4Tzuzgthdvfsrta
