which subject is required for this
For Digital Marketing you don’t need to have any specific subject or Personalized Degree. You can pursue Digital Marketing Diploma or Certificate courses while pursuing your Bachelors degree or your Master’s Degree.
You can get the training for the Digital marketing from online courses or else you can join any of the Institutes to become expert on this.
In order to become a Digital Marketing Manager you should have a strong grasp of current marketing tools and strategies and is able to lead integrated Digital Marketing Campaigns. A Digital Marketing Manager handels the responsibilities to Plan and execute all web, SEO/SEM, marketing database, email, social media and display advertising campaigns, Design, build and maintain the social media presence, Measure and report performance of all digital marketing campaigns, and assess against goals etc.
Good Luck!