Can someone please tell me what are the courses / certifications etc that could be done to start a career in data science . I often used to see phd's in that role . What would it take to enter as a beginner ? How much of an effort / time is realistically needed to get a foot in the door ? Lets say if I put in the rest of this year for prep work would it be worth it in terms of job market . I know there are lots of roles in that area but for some one to enter without prior experience how the opportunities are out there ? I have not completely decided on it yet but I am trying to find information about it before I go further .