These instructions are currently for Fedora 30. I'll update them over the releases if anything changes.
Press the Win/Super key, type software
and press Enter.
Click the Menu Button (☰) and choose Software Repositories. Now enable "Third Party Software" and "RPM Fusion ... Steam"
Press the Win/Super key, type terminal
and press Enter.
sudo dnf update --refresh
Also it doesn't hurt to reboot to make sure you're on the latest linux kernel.
sudo dnf install steam -y
You can either open it from Activities or press the Win/Super key, type steam
and press Enter.
Accept the agreement and it'll download the latest version of Steam.
Feel free to comment below.
I actually made a GitHub account because I wanted to tell you how I (possibly) figured it out lol
When you click the Triple Stack/Layer button, after attempting to install the steam package, go back to the button and you will see the RPM Fusion Steam repository there. Make sure to click and check enabled.