Investing in yourself is the best investment you will ever make. You do not need a certificate that proves that you learned something especially if your are not going to use the knowledge gained. Learning something you will never use is a waste of time and you will never get that time back, beside your will forget the knowledge.
Stop wasting time, this video expresses it well:
This content is restricted to site members. If you are an existing user, please log in. New users may register below.