As a Lexicographer, you will need to master following:

• create definitions

More generally, a lexicographer is also versed in:

• apply grammar and spelling rules
• consult information sources
• copyright legislation
• follow work schedule
• grammar
• linguistics
• practical lexicography
• scientific research methodology
• search databases
• spelling

It also helps to know the following:

• do historical research
• edit dictionary entries
• identify new words
• search engines
• typology
• consult with editor
• manage budgets
• project management principles
• supervise staff
• supervise work
• theoretical lexicography
• translate foreign language
• translate language concepts