The full Windows route to a Nexus onion address, what the operating system keeps behind your back, and the settings worth changing before you start.
nexusb2l7fmqnefwphyy7m5zjhlkytlbo7qbb5lu5dlczr3azgii2gyd.onionnexusma2iqgauqqvjcgds4ckv5xbf272tkfagq4epojjhsgleqpwxiqd.onionnexusabcd6tyfhdwilyitaqiri6tisj2v2hueyjuj6qkvd6azvi5tuqd.onionWindows is what most people have, so this is the most common way in. It also does more logging by default than any other option here, which is worth knowing before you decide it is good enough.
Recent documents, jump lists, thumbnail caches, search indexing and crash reports all happen quietly and all of them can outlive the session. None of that touches the Tor connection itself, which is separate, but it does mean the machine has a memory of what you opened. On a computer other people use, that memory is the weak point rather than the network.
It has no built in way to leave no trace. Everything you do writes something somewhere, and cleaning up afterwards is guesswork rather than a guarantee. That is not an argument against using it, it is an argument for knowing what it is: convenient, familiar, and the least private option on this page.
If the machine is shared, or if you would rather nothing persisted at all, a live system on a USB stick is a better answer and takes about twenty minutes to prepare. It leaves the Windows install untouched and forgets everything when you shut down.
How to get to a Nexus onion address on a Mac, the Gatekeeper prompts you will meet, and which macOS conveniences work against you here.
DesktopThe Linux route to a Nexus onion address, why the distribution package is usually the wrong choice, and what a sensible setup looks like.
MobileTor Browser for Android works and reaches Nexus onion addresses. Why a phone is still the weakest option and what to do if it is all you have.
Where to get Tor Browser, why the source matters more than the version, and the mistakes that put a modified copy on a machine.
The signature check that proves the file came from the Tor Project unmodified, why it is worth the ten minutes, and what a failure means.
Tor Browser ships on its most permissive setting. What the three levels change, why Safest is the right default here, and what breaks.