There should be a link on the Help pages to download as a PDF.
I also highly recommend Sandee Cohen's InDesign Visual QuickStart Guide which is much better reading than the Help pages, and is quite inexpensive. Available either as a paperback or Kindle download for less than US $20.
Thank you Steve. Yes, the CS5 book is still in "print" and in "digital." Peachpit has some very good offers you won't find at Amazon.
There is also a print-ebook bundle for $37.79.
And there is an "all-digital" bundle of ebook, MOBI (kindle), and PDF for $22.39.
If all you want is the printed book or ebook, Amazon is the best prices.
Printed book is $21.02 with Amazon Prime, $14.89 (new) plus shipping, $9.82 (used) plus shipping.
The Kindle book alone is $12.60
Usually videos can be paused and restarted by pressing the spacebar, and/or by hovering the mouse pointer or clicking the video's on-screen area to display controls for forward, reverse, pause, etc. Sometimes there's a progress bar that you can click at a spot to display the video at that position. Sometimes, also, videos display the time within the video of what's on screen at that moment, in minutes and seconds, and also the total duration of the video. For anything you want to return to, you can write down times and make notes of the content, and later you can drag (aka "scrub") the timeline marker, or use fast-forward/reverse to return to that scene and replay it.
...Also there appears to be no way to stop the tutorial and go back to a certain part of it that I have missed.