Digital marketing is for those who are creative and passionate about internet. To pursue digital marketing course, you only require basic internet knowledge and creative mind and a motivation to delve into the field. I am attaching a list of online and offline course from which you can choose. All you have to do is make a comparative study of your selected course and apply for them on the respective institute website. What I would suggest is that you follow blogs of the top digital marketing companies and try to intern with them. Then you can pursue some of the free online courses.
Before opting for a digital marketing course online or offline, here are some pointers to evaluate the desired institute or course structure.
Certification: Certification is no substitute for skills learned and hands-on industry experience but, nevertheless, can add to the CV of a fresher making an entry into the field or for a professional looking to make a career switch. Opt for certification courses recognised by various educational bodies and corporate.
Course Curriculum & Faculty Expertise: Gauge the institute or the course offered based on the curriculum, faculty expertise, training modules and relevance to the current industry trends and practices.
Reviews and recommendations: Check for reviews and recommendations from industry experts and former students through online education portals or discussion forums. Reach out to alumni on LinkedIn/Twitter for their direct feedback, where possible.
Placements: Explore the institutes placement opportunities or institutional tie-ups for live projects and hands-on experience on acquired digital marketing skills.
You can also read this post on Top Digital Marketing Blogs In India as these blogs can help you get started on the learning path:
https://www.socialbeat.in//2015/04/22/top-12-digital-marketing-blogs-in-india/ONLINE
Digital Vidya
Online Marketing Institute
TalentEdge
Manipal ProLearn
Simplilearn
Internet and Mobile Research Institute(IMRI)
Digital Academy India
AIMA
Digigyan
CLASSROOM
NIIT
DMTI
EduPristine
DSIM
Echovme
Simply Digital
Learning Catalyst
SACAC
Online Marketing Institute and Training (OMIT)
Digital Nest
Social Samosa
You can also look at some global marketing courses on Hootsuite Social Media Certification, Hubspot Academy, Google Digital Marketing Course, Market Movie.