You need to create CCK-field. For example you may need to create CCK-field from hook_update_N.

Some modules work incorrectly with PHP 5.3. Many hosters have PHP 5.2 and you should have environment similar to server’s one for developing. Therefore it is necessary to downgrade php packet updates.

This article describes how to find and understand changes in Book module. This will make you able to adapt snippets and modules which interact with Books module in Drupal 6.

Allows a blacklist of sites that will have a rel="nofollow" attribute added to their link tags whenever used on your site. Originally the only page in the blacklist was Wikipedia, though it now allows an …

From this article you will know how to forbid search engine bots indexing and following certain links.
Solution

This article is devoted to changing of the standard search box which is passed to .tpl.php through $search_box variable.

 
You need to run cron frequently (for example, every 10 minutes). And meet some problems on this way.
Modules launched by cron work with external sites and connection with them can be bad or script …

 
This article would tell you how to create back of database automatically on a regular basis.
Solution (for Unix users):

This article would tell you how to create backup of your Drupal-based site in different ways:

Using Unix command (you will need SSH-access for this)
Through site control panel
Downloading files by FTP from server

Using Unix …

This article would tell you how to manage your Drupal-based site on Unix-server through terminal (SSH).
Solution