The Tails Project released the live OS Tails 5.3, a live operating system that runs from any computer without leaving a trace on the machine but not on the internet either.
This particular operating Tails was used by her former employee NSAEdward Snowden to stay hidden on the internet.
To use Tails, shut down your computer, and boot the anonymous OS from a USB stick instead of starting with Windows, macOS, or Linux. This is how you turn your computer into a very secure machine. You'll be safe even if you're using someone else's computer.