qBittorrent has an inbuilt torrent search function that can search multiple sites from inside the client. you should honestly never need to go to a website, download torrent files, or open magnet links, ever.
if you can host Jackett it really broadens your search options but isn't necessary.
if you decide to host Jackett think about also hosting qBittorrent at the same time since you're already setting up self hosting stuff it's not anymore difficult and the webUI is super convenient.