This guide provides a step-by-step process for creating a custom script in Zsh terminal that automatically opens the current GitHub pull request for the repository being worked on. The script requires jq and hub to be installed, and it checks if the user is inside a Git repository before proceeding. If there's no corresponding pull request, the script prompts the user to create one. The guide also explains how to make the script executable and add an alias for easy access in the terminal.