Because I am too lazy and tired to explain it myself, I give three links.

https://steemit.com/security/@creationlayer/tor-browser-secure-setup

https://tor.stackexchange.com/questions/6893/why-doesnt-tor-browser-disable-cookies

https://www.wilderssecurity.com/threads/what-are-the-optimal-settings-for-maximizing-anonymity-while-using-tor-browser.337575/