I’m surprised not one has brought up Lena Pejgan Wiberg’s excellent answer to this in her career building AMA, available on YouTube: https://www.youtube.com/watch?v=sj-yquQLTQM
My response would be it can be anything you are comfortable with and can be in multiple places depending on what you want to show.
For the Essentials Certificate we encourage learners to build up a portfolio in whichever way works for them. It could be as simple as as public shared drive like Google Drive for example where you could link to GitHub and others. A website or anything publically accessible.
I checked and it has been discussed on the Club before, Do you have a testing portfolio?
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