I remember ubuntu like a system which had every repository that I could enable and download apps. But now in fedora I can use only her repository and it's all. Do you know if I can change my fedora to be more like ubuntu?
you can download rpm from sites like rpmfusion and rpmfind etc.RPM Fusion Repo
or repositry information can be manually entered & configured in /etc/yum.repos.d/rpmfusion.repo
once a repo is added to yum, you can enable/disable using "yum --enable-repo" or "yum --disable-repo"
If you are not satisfied with the vanilla version of Fedora, you can try FusionLinux. Its 100% compatible with Fedora and combines free and non-free software to bring the user the most advanced experience on the Linux platform.