I learned something new today. I haven't been able to work out how to hide a small portion of a review if I wanted to put a spoiler in. Now I totally get how to do italics and bold here on Goodreads. I thought I would show anybody who was in the dark like myself.
A lovely Goodreads librarian showed me how.
Simply type <spoiler>in front of the first word you want to start the hidden spoiler from and then </spoiler>at the end of the area you want hidden. It's that easy.
Then it should look like this:
You may have more than one area in your review you want to hide so the reader can chose to click on the spoiler and read if they want and it's not visible to everybody.