Portfolio so far:

Gather together all of your homework and class-work done so far this semester, complete with the original and any comments or addenda that might be associated with it.  Arrange it neatly in dome rational order.  This may be simply chronological: either “forward” or “backward”, that is with either the earliest work or the most recent work at the front.  Alternatively, you may choose to cluster the work topically, or by some criteria that you devise.  If so, make the criteria and cluster titles clear.

Bind the materials in some fashion that holds them effectively, while making them accessible (e.g. not an envelope).  This might be a folder with clasps, a loose-leaf notebook, or some other similar device.  It does not have to be new, but it should be clean and tidy.  It must allow future work to be inserted and included.

Conserve resources.  Most or all of the portfolio contents already exist.  Reuse - recycle - .... review.