Learning a skill is not enough. You need to have a certification so that while going through your resume recruiters can filter a certified and non-certified candidate. So, having a certificate gives you more opportunities than others.
You can go through Data Science tutorial which will help in nourishing your skills Data Science.
Also, for learning some very important topics you must watch this Data Science video tutorial:
For getting a job as a Data Scientist you should be a professional in Data Science and you need to have a certificate for proving it, so, you should go for Data Scientist to make your career rise to the next level.
Apart from enrolling in online courses, you should also prepare for job interview questions. To curb this, check out these Data Science Interview Questions and land in a job as a Data Scientist.
Happy Job Hunting.