first pay attention to the third party repos
they can be incompatible
rpmfusion-free-updates -- might cause problems
koji-override -- might cause problems
the normal "updates"
"google-chrome" should not cause many problems , but might
is the yum plugin "priorities" installed and CONFIGURED !!!!!!!!
it is designed to keep incompatible repos from KILLING your install
but it has to be configured
Have you read through the fedora and redhat documentation ?
the others are on the left window
not all guides get posted for new versions
you will need to look through the last few versions