I can cover a wide range of topics, but these are the ones I focus on:

• (X)HTML 1.0
• CSS 2.0+
• Joomla
• PHP

If you are looking for an abstract knowledge of the Internet and web design in general, I can cover the principals and history of:

Internet Basics

• Internet History and the Web Paradigm
• Routing
• DNS Resolution, BIND, and nameservers

Hypertext Basics

• Hypertext Transfer Protocol (HTTP), Apache, and IIS
• eXtensible HTML and the WWW Consortium (W3C)
• Cascading Style Sheets
• Server Side Scripting (PHP, ASP, JSP)
• Client Side Scripting (Javascript, VBScript)
• Common Gateway Interface (Perl, C++, Java)
• Compilation versus Interpretation basics
• Browsers (Mozillia, Firefox, MSIE) and HTML Rendering
• The Old Internet and Web 2.0

Other Protocol Basics

• File Transfer Protocol (FTP)
• Secure Shell (SSH)
• Mail Systems (POP3, IMAP, sendmail)

Hosting Basics

• Hosting Control Panels (DirectAdmin, CPanel, WHM)
• Linux versus Windows
• Apache versus IIS
• Security
  • Firewalls
  • Hacking
  • SQL Insertion and PHP Safe Mode
  • Encryption
  • User Permissions
  • Updating
• Toubleshooting (ISO OSI model, KISS, Common Problems)