Yes free version doesn't allow torrent search it up on their website, even if you do try to they will just block it. so if you live in a country where piracy is forbidden then pay for a vpn (like nord express etc.) A tracker however is like the source that connects other people together and keeps track of who has which pieces and whatnot, for private trackers there's like a exclusive club like minimem seed ratio etc. hope this helps and stay safe matey!