Portfolio isn’t something for just artists.
A portfolio for desingers would be design work.
A portfolio for musicians would be songs or music piece.
What about business men?
A portfolio for business men would be successful business.
However, this is why it takes a long time to have one.
Keep this in mind.
You need be able to present others with your portfolio.
If you can’t, you don’t have a focus in what you do.
Which means, you’ve accomplished nothing, yet.