Tropes are devices and conventions that a writer can reasonably rely on as being present in the audience members’ minds and expectations. On the whole, tropes are not clichés. The word clichéd means “stereotyped and trite.” In other words, dull and uninteresting.
It has a bunch of entries about wikis and Wikipedia. And, of course, Wikipedia has an entry of the TV Tropes Wiki.
A while ago, the site got hacked and was destroyed. Unfortunately, it wasn’t backed up, but through the dedication of the contributors they re-created the whole site by copying from the cache function of search engines which sounds like a difficult process. Its back up to normal again. Its a popular site which is probably why it attracted a hacker. They had a discussion forum, but the code of the forum was a risk for further hacking and so they got rid of it.
There are some Wikipedia entries that are about or related to the subjects found on TV Tropes. There is the Narratology Category, and there is the Film Theory Category. Tropes also relate to Comparative Mythology and Folklore Motifs.