I used to use thepiratebay.org, but recently it seems the quality of the site has degraded.
I sometimes also use 1337xx.to , but that site seems to have a very small selection.
Note that I couldn’t find an answer to this question in the wiki + meathread, so if the answer is already there, please direct my attention to it 🙏🏴☠️
the plugins are already built-in in the standard installation, you just have to enable them before first use and that is it. after that you just use the search box.
Sometimes you have to open the plugin thing on the search tab and click “update” to get them to appear