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Sure! GitHub recently made changes to their authentication system to improve security. Instead of using your GitHub password to authenticate when pushing or pulling changes to or from a repository, you'll need to use a personal access token. Think of it as a one-time password that grants access to your GitHub account when doing certain tasks like pushing to a repository or performing other Git operations. Personal access tokens are unique and can be created and managed within your GitHub account settings.

To generate a personal access token, follow these steps: 1. Go to your GitHub account settings. 2. Click on the "Developer settings" tab, followed by "Personal access tokens". 3. Click the "Generate new token" button. 4. Give the token a description (e.g. "Git push and pull token"). 5. Select the scope of the token, indicating what permissions it should have (e.g. "repo" scope for full access to repositories). 6. Click the "Generate token" button. 7. Copy the token and use it instead of your password when prompted while pushing or pulling in your Git client.

Note that personal access tokens are like passwords and should be kept secret. Also, be sure to only grant the necessary permissions required for the task at hand.