Hello student,

There are several courses of digital marketing. Few diploma courses are available and few bachelor's courses are available. Diploma courses usually take 3 months to complete it and for bachelors it takes 4 years. It totally depends on the time you are willing to and you can choose accordingly between bachelors and diploma.

There are several opportunities, you can do          1. SEO

2.SMM

3. Email marketing

4. Affiliate marketing

5. Freelancing

Hope it helps.