https://devdocs.magento.com/guides/v2.3/install-gde/install/sample-data-after-magento.html?itm_source=devdocs&itm_medium=search_page&itm_campaign=federated_search&itm_term=sample%20data

1，composer自动安装
https://devdocs.magento.com/guides/v2.3/install-gde/install/sample-data-after-composer.html

2，手动下载样本数据安装
https://devdocs.magento.com/guides/v2.3/install-gde/install/sample-data-after-clone.html