How to make CSS modifications the proper way in Drupal 7

Step-by-step instructions how to use an alternative file for CSS modifications (avoiding overwriting with updates).
Step-by-step instructions how to use an alternative file for CSS modifications (avoiding overwriting with updates).
The more link can only show it there is a page the link can point to. Solution: Define a page.
The Views Slideshow i.e. the Slide/Picture of Views Slidehow is hiding the menu (Dropdown, Nice Menu, Superfish, etc.). Quick Fix for the Problem.
How to disable a particular part in the source code of CSS? How to add headings or comments to CSS files?
Step-by-step instructions how to solve the CSS conflict between the Marinelli theme and the Gallery Formatter module.
Step-by-step instructions how to choose, download and install a theme in Drupal 7.
Occasionally a site user or developer will navigate to a page and suddenly the page content disappears, and it becomes blank. No content.
Step-by-step instructions how to see the PHP values of your server using a phpinfo.php file.
Step-by-step instructions how to increase the upload size in your php.ini or .htaccess file.
Step-by-step instructions how to enable the Superfish menu within the Danland theme or Danblog subtheme (Drupal 7).