Further explanations in dev/README #2
Description
- Connecting services
- Detailed instructions to install module in Magento installation for development
auth.json- GrumPHP and typical errors
- not found Magento classes due to missing dependencies, and how to find versions, e.g. https://github.com/magento/magento2/blob/2.4/app/code/Magento/Catalog/composer.json#L54