If you have a (iPhone X and older, including iPad 7th gen and older), palera1n is the current gold standard. While it is primarily a command-line tool for macOS/Linux, Windows users can run it successfully using a live Linux USB or WSL (Windows Subsystem for Linux).
GitHub - palera1n/palera1n: Jailbreak for A8 through A11, T2 devices, on iOS/iPadOS/tvOS 15.0, bridgeOS 5.0 and higher. GitHub. goldra1n windows link
Goldra1n is not for modern iPhones (iPhone 6 or newer) or recent iOS versions. Using it on unsupported devices will not work. If you have a (iPhone X and older,