When learners click on a URL, they will go to the page on the relevant search engine that gives a list of sites that are clearly related to the topic. Of course, you will probably want to check the sites out, yourself. The URLs are all here, on this page, for convenience when you're planning your lessons. But theURLs for each category have also been made into separate pages for easy student use. Anybody can put up anything on the web.
Some websites are accurate and authoritative.
It can be hard to tell. It can be even harder in a second language. Here are some websites designed to improve learners' abilities to make intelligent judgments. They are not directed specifically towards language learners, but they can be useful. Here is a site designed to help web users use search engines more effectively.