What does the ClassLoader Component do?

Which autoloaders does Symfony provide?

How to enable an autoloader in your app/autoload.php file?

Which classes in the ClassLoaderComponent allow you to cache the mapping from a class to its containing file?

What method does the object that the ApcClassLoader or XcacheClassLoader wrap around need to implement?

$locator = new FileLocator($configDirectories);
$yamlUserFiles = $locator->locate('users.yml', null, false);

What do the parameters of the locate() function represent?

How does Symfony find the right loader to load your files?

In the dev env, how does the ConfigCache determine if it isFresh()?

What does your bundle need to return in order to have a custom, valid configuration?

What is Normalization used for in the configuration?