We do not issue certificates for finishing free courses. Your progress is recorded on your profile page, which you can share with employers, teachers, and friends. Many users include a screenshot of their profiles in their CVs, and many more use their projects and portfolios as proof that they have learned certain skills.
If you are interested in getting your skills certified or building career-ready portfolios with us, check out Codecademy Pro. Through our premium product you can receive guidance for building real-world projects and then have your code reviewed by professional developers to verify that you have accomplished your goal. Code review is vital for us to be able to truly certify that you have learned and applied your skills.