Directory Structure in magento 2

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Magento 2 directory structure are pretty much self explained only by it's name. If you are inside root of your magento project then you would see following directory...

/app
/bin
/dev
/generated
/lib
/pub
/var
/vendor

/app

In this folder, you will find following subfolders:

/code

It includes the Magento 2 core code (One of the locations where you can develop your custom Magento 2 code (custom modules). In some cases, you might not find the core code here. In this case, it’s placed in /vendor/magento directory.

/design

This directory has /adminhtml and /frontend sub-directories which contain theme directories having phtml, xml, JS and LESSfiles.

/etc

This directory contains the di.xml and env.php configuration file, the di.xml file contains class mapping and interface preferences. The env.php file contains the configuration details of your Magento 2. It also contains config.php which contains the list of modules, enabled as well as disabled ones.

/bin

This directory contains the Magento 2 file or a CLI script;
This CLI script is used to run commands like: enable/disable cache; enable/disable modules; run an indexer, upgrade, deploy etc.

/dev

In this directory, Magento 2 tools for development and its test scripts are placed.
When you make a new theme and want to execute LESS files for that theme, after installing grunt you have to go to /dev/tools/grunt/configs/themes.js and define your theme with the previously defined themes.

/lib

This directory contains Magento 2 libraries packed separately from Magento 2 core files.
there are two sub-directories /internal and /web
In /internal subdirectory there are server-side libraries and several font files.
In /web subdirectory there are client-side (JavaScript) libraries, jquery, modernizr, requirejs, prototype, scriptaculous.

/pub

In this directory, you have the currently running code after the execution of all commands (upgrade/deploy). If you want to make changes and don’t want to run the commands (upgrade/deploy) again and again, you can change the code in /pub directory and can see the changes on the frontend.

/var

In this directory, you have all the cache of your Magento 2, like
cache, composer_home, generation, log, di, view_preprocessed, page_cache.
(In Magento 2.2.x and later versions, the directory var/generation was removed to the project root and renamed to generated.)

/vendor

This directory is generated by composer using composer.json file.
It includes the packages that have been defined under composer.json.



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