Where is Arduino on Fedora? I am trying to install the Teensy loader software but I need to know where Arduino is installed. Does anyone know where in Fedora the Arduino files are?
It depends how you installed it. 

If you downloaded the tarball and extracted it then it's wherever you extracted it. 

If you used a package manager to install it then they could be anywhere - you should look at the package manager software fedora uses (yum? it's been a while) to see how to find what files a package installs.

If you are running a modern version of Arduino (I know Debian based packages are from the stone age) then the board manager installs will be in ~/.arduino15