I followed your instructions (Gulp Quick Start). I'm new to this new tools, so I ask: is it normal that YARN creates a "node_modules" directory containing TENS OF THOUSANDS of folder / files??? It looks like there's every module existing in the world, not only those required for Metronic. I'm just curious if I did something wrong. Thanks.
It is normal for the node_modules folder to have those folders/files. All external modules that the project depends on will be in this folder. It is automatically generated and not included in the project zip. Only the plugins name are listed in the package.json file. So everyone would get the plugin libraries.
You can check this for more info.
Thank you very much for your kind reply!