How to change the format while creating Language Copy for a project?

Create a language root and language copy inside the root, before creating a translation project.

For example,
Create a language root at /content/geometrixx with name as fr_LU (and title as French (Luxembourg)). Subsequently, create language copy of page from the references panel and navigate to Create structure only option in Create & Translate. Finally, create a translation project and then add the language copy to the translation job.

For details, see the additional resources below:

How to audit AEM capabilities such as, login attempts and ACL or permission changes?

AEM has introduced the ability to log administrative changes for better troubleshooting and audit. By default, the information is logged in the error.log file. To make monitoring easier, it is recommended that they be redirected to a separate log file.
To redirect the output to a separate log file, see How to audit user management operations in AEM.

How to enable SSL by default?

Adobe Experience Manager (AEM) 6.4 ships with the SSL wizard and offers a User Interface to configure Jetty and Granite Jetty SSL support.

To enable SSL by default, see SSL by default.

The Content Services are based on the Sling Models and the AEM developers must provide a Sling Model pojo for each component that is exported.

To understand how to consume AEM content services from a React application, see Get Started with AEM Content Services tutorial.

Also, if the developers want to export a tree of components they can also implement the ComponentExporter and ContainerExporter interfaces and use the ModelFactory to iterate over the child components and return their model representation. See the resources below:

[1] Adobe-Marketing-Cloud/aem-core-wcm-components

[2] Apache Sling :: Sling Models

How to disable AEM 6.4 survey pop-up?

You can opt into usage statistics collection by using either the Touch UI or the Web Console. For detailed instructions, see Opting into aggregated usage statistics collection.

Is there a good resource that highlights the key features for upgrading to AEM 6.4?

See Understanding Reasons to Upgrade AEM that describes high-level breakdown of key features for customers considering upgrading to the latest version of Adobe Experience Manager.

Assets

Why the Assets workflow repeats itself while uploading MP4 files (for example, using drag-and-drop method)?

If the user, uploading the movie files does not have delete permissions under asset node, the delete chunk nodes fail and the upload restarts.

What are the default settings for out-of-the-box configurations while creating Language Copy?

When you create a language copy through Touch UI (References > Update Language Copy), a new DAM folder is created under the new language and assets are referenced from there.

This is default setting for out-of-the-box configurations. You can set Translate Page Assets = Do not translate in Translation configurations.
For AEM 6.4, Tools > Cloud Services > Translation Cloud services.

How to disable an AEM component causing exponential growth for the AEM SegmentStore (AEM 6.3.1.1)?

You can disable the OSGi Component Disabler. To use this service, see OSGi Component Disabler.

As a workaround, you can also manually disable the component either via the UI or via a curl command (example below), after every AEM restart.

curl -u admin:$(pass CQ_Admin) 'https://localhost:4502/system/console/components/com.day.cq.analytics.sitecatalyst.impl.importer.ReportImporter' --data 'action=disable'

How to customize admin consoles?

AEM provides various mechanisms to enable you to customize the consoles and the page authoring functionality of your authoring instance. To learn how to create a custom console and customize a default view for a console, see Customizing the Consoles.

What is the difference between CoralUI 2 and CoralUI 3-based components?

A new set of Sling components of Granite UI Foundation is created for Coral3 and is located under /libs/granite/ui/components/coral/foundation. There is one set for CoralUI 2-based components and one set for CoralUI 3-based components. The new set will not be just a copy-paste of the old set, rather it will be cleaned up (for example, streamlining, removing deprecated feature). So it is recommended that a page only use either CoralUI 3-based or CoralUI 2-based set.

To learn more in detail, see Migration Guide to CoralUI 3-based.

How to customize the search component in AEM Assets?

To learn about search boost/ranking and further implementation information, see Simple search implementation guide.

The Simple search implementation are the materials from the 2017 Summit lab AEM Search Demystified.

Is it possible to build plugin for WordPress that allows a customer to access Adobe Asset Picker to select images ?

Yes, a customer using WordPress can use Adobe Asset Picker to select images from their AEM Assets server to add to posts on their WordPress site.

Refer to Asset Selector for more information.

Experience Manager