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Complete the following Codewars problems:
https://www.codewars.com/kata/nothing-special
https://www.codewars.com/kata/sentence-count
https://www.codewars.com/kata/oh-dear-god-is-it-bugged
https://www.codewars.com/kata/authenticate-a-list-of-usernames
https://www.codewars.com/kata/mexican-capital-s-phone-number-validator
https://www.codewars.com/kata/regexp-basics-is-it-ipv4-address
When you're ready, move on to Introduction to Functional Programming