Do I need to setup firewalld on fedora28?

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Fedora 28 ships with Firewalld pre-installed.
The firewall is active and running by default.
Learn how to use it : Fedora WIKI Firewalld
Here are the commands to verify the status :

$ sudo dnf list installed | grep firewalld
firewalld.noarch                     0.5.3-2.fc28                    @updates
firewalld-filesystem.noarch          0.5.3-2.fc28                    @updates

$ sudo firewall-cmd --state
running  

$ sudo systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled;  
                                               vendor preset: enabled)
   Active: active (running) since Tue 2018-09-11 12:05:25 CEST; 2h 40min ago
     Docs: man:firewalld(1)
 Main PID: 755 (firewalld)
    Tasks: 2 (limit: 4915)
   Memory: 39.7M
   CGroup: /system.slice/firewalld.service
           └─755 /usr/bin/python3 -Es /usr/sbin/firewalld --nofork --nopid

If you want to configure the firewall via GUI :

sudo dnf install firewall-config

You can check what's installed and available :

$ sudo dnf list firewall*
Last metadata expiration check: 1:34:17 ago on Di 11 Sep 2018 12:16:19 CEST.
Installed Packages
firewall-config.noarch               0.5.3-2.fc28                    @updates
firewalld.noarch                     0.5.3-2.fc28                    @updates
firewalld-filesystem.noarch          0.5.3-2.fc28                    @updates
Available Packages
firewall-applet.noarch               0.5.3-2.fc28                    updates