Operating systems (Computers) 29 Design 24 Web sites 22 Computer programs 14 Web site development 12 Database management 10 Computer graphics 9 Photography 8 Computer security 7 Digital techniques 7 Authoring programs 6 Business 6 Computer animation 6 Relational databases 6 Wireless communication systems 6 Cascading style sheets 5 Computer software 5 Data processing 5 Database design 5 Electronic spreadsheets 5 Internet marketing 5 Internet programming 5 Investments 5 Java (Computer program language) 5 Testing 5 XHTML (Document markup language) 5 Certification 4 Computer hackers 4 Computer networks 4 Development 4