Python (Computer program language) 7 Java (Computer program language) 6 Machine learning 6 Development 5 Application software 4 Computer networks 4 Data mining 4 Computer security 3 Penetration testing (Computer security) 3 Artificial intelligence 2 Data processing 2 Design and construction 2 Electronic data processing 2 Hacking 2 Mathematical statistics 2 Natural language processing (Computer science) 2 Neural networks (Computer science) 2 Security measures 2 Agile software development 1 Cloud computing 1 Computer network protocols 1 Computer programming 1 Computer software 1 Data curation 1 Database management 1 Electronic spreadsheets 1 Go (Computer program language) 1 Hackers 1 Java virtual machine 1 Kotlin (Computer program language) 1