Better usage examples are shown above. However, some are shown below.
# Scrape tweets from a user
twint -u <User>
# Scrape keywords from a specific user
twint -u <User> -s <Word>
# Scrape keywords from verified users
twint -s "Doge" --verified
# Scrape followers from a specific user
twint -u <User> --followers
# Scrape who a specific user is following
twint -u <User> --following
# Scrape tweets from a specified date
twint -u <User> --since 2015-12-20
# Output results to a CSV file.
twint -u <User> -o <File.csv> --csv