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You mean the difference or getting to know more indexers? I guess this is what you mean. Indexers keep the torrent files, make their database accessible to humans and sometimes to machines through APIs. Trackers are those puppet masters in the back talking with clients, knowing who is online, seeding or how much a downloader already downloaded. And they can be completely free and independent from any indexers, like OpenTrackr. You can even seed your own torrent over this tracker, completely open and free. Or you could simply host your own. And to confuse you even more, every BitTorrent client is itself a tracker, too. Kodi is quite cool on its own, even cooler if you use things like LibreELEC which is a Linux OS with the Kodi interface built specifically for usage as a set-top box you simply plug in into your TV. A central device with which you can watch TV, Netflix, YouTube or your own videos from local or remote storage, plus support for different remotes and quite a bit more. Works on full-fledged PCs and on computers as tiny as a Raspberry Pi. You should look into that. You might get amazed.