In order to be a good language learner, it is important to start with the 1,000 most important words in the language. This is because these words make up 80% of all conversations.
Listening skills are an important part of being a spy. It is possible to pick up on many clues about a person's intentions from their language and dialect.
Code switching is the ability to switch between languages or dialects quickly and easily. This is an important skill for spies to have.
Body language is an important skill for spies to master. It is possible to pick up on many clues about a person's intentions from their body language.