How to reset fedora24?

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You problem is related to a mal-configured repository file from Google, which is likely to be a simple typo! Those files are located in /etc/yum/repos.d/and contain information about the software repository (like an on/off switch, links to the url where the packages are located, link to gpg key that was used to sign packages, etc.).

You have several options:

• Fix the repo that is giving you trouble:
  • Set gpgcheck=1, without the spaces before and after =
  • Make sure gpgkey=https://...starts in the next line beloew the gpgcheck line, not right after.
• Disable the repo:
  • Set enabled=0
• Delete the repo:
  • sudo rm -rf /etc/yum/repos.d/google64.repo (needs exact name for the repo)
  • sudo rm -rf /etc/yum/repos.d/google*.repo (more radical, removes all google-repos)

Why did you install that repo? If it is for Chrome, I'd recommend you deleting this repo and install Chromium from the official Fedora repo: dnf install chromium.

If that problem is all that is bothering you, there is really no need to reinstall Fedora, or manually chasing and reverting all custom settings made after installation.

No need to reset anything, you can go to /etc/yum.repos.d/ and edit your google64 repo to disable it if it isn't working. That will make the error go away. Even if you don't do that, your installation is probably fine and that is just a warning.