How to download and setup wp-graphql
Open terminal and run command
                                            git clone https://github.com/wp-graphql/wp-graphql.git
                                        
                                        git clone is used to create a copy or clone of wp-graphql repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with wp-graphql https://github.com/wp-graphql/wp-graphql/archive/master.zip
Or simply clone wp-graphql with SSH
                                            [email protected]:wp-graphql/wp-graphql.git                                    
                                    If you have some problems with wp-graphql
You may open issue on wp-graphql support forum (system) here: https://github.com/wp-graphql/wp-graphql/issuesSimilar to wp-graphql repositories
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