two ways besides copy and paste.
1. Save as...
Right click on page
click Save as
choose either Webpage HTML Only or Webpage Complete
name page with a name you choose, it's hard to change later.
option: Webpage HTML Only = will save only the text and not any images. When you click on this link on your computer, all the images will be missing. If the page tries to connect to something (maybe load an ad), it may give some error message. It's not perfect but you can save the text.
option: Webpage Complete = will save all the images and some other types of files. It saves the page and a folder of stuff. You have to keep those two together for the page to display correctly when you open it.
2. Save a screenshot of the page
I use the Chrome extension called Awesome Screenshot and like it alot. This method of saving the page will display the text as part of an entire image. You can't do any highlight, copy and paste of the text later nor can you do a word search within the text.
I have saved quite a lot of webpages and these, as well as copying stuff off into a Word-type document, are the methods I use. Naming the files is crucial (the default names while saving are often too long or not descriptive enough). I do have an old html editing program that lets me go in and clean up some of the pages I save so I don't get error messages or ads trying to load.