There is one way of learning in depth that I have not mentioned. This is to hold your place where you already are in the book and work around that point. That is to review that page. then go back  one page and then go forward a few more pages.  Then go back a few more pages. But I do not mean this in place of a regular in depth session with review back to the very beginning, nor in place of the sort of very fast learning [called ''girsa''].