Your current email is <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/><x id="INTERPOLATION" equiv-text="{{ user.email }}"/><x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>. It is never shown to the public.
This will delete all your data, including channels, videos, comments and you won't be able to create another user on this instance with "<x id="PH" equiv-text="this.user.username"/>" username.
Two factor authentication adds an additional layer of security to your account by requiring a numeric code from another device (most commonly mobile phones) when you log in.