When you want to ensure your computer activities leave no trace on your computer, try Tails (https://tails.boum.org/. Tails is live booted on a computer on a CD or USB stick. As it runs in your computer’s RAM, and shuts itself down automatically when physically removed in the case of an emergency, it cannot leave evidence on your computer’s hard drive (unless you choose it to).

Tails by design is intended for anyone to use it with ease. This is a particularly useful tool for any activist who seeks to speak out online anonymously through Tor, but is not technologically adept enough to utilize and/or does not have the resources to dedicate a computer to run Whonix