The Oracle MOOC (Free Oracle Massive Open Online Course) is a great opportunity to enter the world of Oracle technologies. The SQL Fundamentals 2018 course began on January 8th and it’s open for 31 days, so you have still chance to take a part and get reward. The course is 100% free.
Course page: Oracle MOOC: SQL Fundamentals (2018)
Information: You don’t have to download Oracle Developer VM. Most of examples works fine on Oracle 11 Express Edition Database.
Reward: You can earn badge like below