Trailhead GO is a free iPhone app developed by salesforce.com, designed to help you learn in-demand skills and land a top job with Salesforce technology. The app offers training for Salesforce Admin, Salesforce Developer, Salesforce Marketer, and other roles, all from the convenience of your phone.

The app provides quizzes to test your knowledge as you learn, and you can earn resume-worthy credentials that companies are hiring for. You can also connect with the global Trailblazer Community to collaborate with other learners, build your network, and give back together.

With Trailhead GO, learning is fun and rewarding. You can earn points and badges as you learn new skills, and climb up the Trailblazer Ranks. Overall, Trailhead GO is an excellent app for anyone looking to improve their Salesforce skills and advance their career.