One of the advantages of using TYPO3 is that this CMS has expandability possibilities that are called "extensions". Using these extensions, you can extend the TYPO3 functionality. You can manage shops, galleries, forums, or even a small community portal.

You can download extensions from the TYPO3 extension repository (TER): http://typo3.org/extensions.

*.t3x is the file format used for extension files. This package is partly compressed using GZIP and it contains the necessary files for the extension (SQL dump, tables, functions, templates, image resources, and so on). This site is a recommended easy way to search for appropriate and suitable extensions. Also, you can find an overview of the extension functionality and additional documentation. For easy extension installation, use its import through Extension Manager.

In the extensions section,http://typo3.org/extensions, you'll find the following:

All the extensions are sorted in groups according to their status:

For our new shop, we need an eCommerce extension that provides product catalogue and functionality of a shopping cart. You can type shop or commerce in the search area and get a few versions of online shop extensions and those extensions that provide extra functionality to basic extensions.

Note the most popular and downloaded online shop extensions:

The difference between these extensions is the functionality. For our online shop creation, we chose tt_products. This extension is updated, well-documented, has a lot of nice features, and has flexible configuration possibilities.

You can click on the extension title and find the basic information about the extension: the author, the updated date and version, a link to the manual, information about changes in the current version, decryptions, and dependencies.

There is an available download link under the extension's description. You can use this link to download the extension to your hard drive.

You can log into your TYPO3 installation using the backend:

http://www.yourdomain.com/typo3.

To get authorized in the TYPO3 backend, you need to activate Cookies and JavaScript. New Internet browsers automatically support these options. In the older browsers like Internet Explorer 6, JavaScript was switched off for security reasons. This is why authorization in the TYPO3 backend can be unsuccessful in older Internet browsers. The is a screenshot of the backend login form:

Type in the username and password. The default username is admin and the password is password. After you are logged on, for security reasons change the password by clicking on the link in the warning window or in the section User Admin:

Change the username admin and password to your chosen identification data. You can enter a name, e-mail, and preferred language, and save the data by clicking on the Save and close document button.

After the identification data are changed, update the reference index by clicking on Update Reference Index.

You could get to this function from the main backend page or choose it from the side menu in the section DB check. Choose the section Manage Reference Index and click on the Update Now! button. The following screenshot shows the Extension Manager in the BE administration panel:

For extensions imported to TYPO3, use the Extension Manager. Choose Import Extensions from the drop-down menu at the top. The easiest way to install new extensions is to use the function at the top of the module under List of look up reviewed/all extensions. Hit the Retrieve/Update button to get a list with the updated extensions and enter the necessary extension name, for example "tt_products".

The extension will not be found if it isn't "reviewed". For switching this off, choose Settings from the drop-down menu, and check Enable extensions without review (basic security check) under Security Settings.

Now go back to the section Import Extensions. First, update the list of extensions by clicking on Retrieve/Update. When the list update is complete, in the search field type the extension name—in our case "tt_products".

In the search results you would find the extension tt_products and extensions that have a similar name or description:

Press the import button with the red arrow for the extension import to your web server. After the import is successfully done, you can go on to the extension installation.

Now press the + icon for Install extension. The following screenshot shows the extension installation step with the data import in the database:

Click on the Make updates button, and the extension will automatically add new tables and a new upload folder tx_ttproducts with subfolders (for product images, datasheets, rich text editor (RTE), and bills). The following screenshot shows the additional settings for extension:

After the extension is installed, you can choose extra options or leave the default settings. We recommend leaving Flexforms. For using Flexforms, you don't have the additional install extension fh_library that is needed only for tt_products versions 2.5.2-2.6.0.

Also, we require the extension Table Library (table) for the extension tt_products.

All the extensions are available at TYPO3 TER. For better search results, you can write the full extension title or part of it—for example, 'Static Methods' (without quotes).

The tt_products dependencies that are compulsory for the operation of the extension (at the time of writing this book) are: