Many online files let you download the instructions in pdf format. If they don't and ;you "save as" it will save it as a 'mht' format which is actually a link back to the original web page. If that page is taken down later you will not be able to access it again. I learned to 'cut and paste' instructions into a word document and save it on my computer that way.
this way also allows me to make pictures smaller(most web pictures are too large) and change fonts, etc. A bit labor intensive but easier than saving links that disappear.
How do you"make a pdf" out of tutorials or blogs? These are some of the ones I cut and paste. I'd love to make a pdf and be done with it.