How to list startup services at boot time in Fedora

Open the terminal application. Type the following systemctl command to list running services:
systemctl -t service --state=active

How to list all services on Fedora

systemctl -at service

You can use the following ls command too:
ls /etc/systemd/system/*.service
ls /usr/lib/systemd/system/*.service

How to display all enabled services using systemctl of systemd on Fedora

To list all enabled services in Fedora Linux, type:
systemctl list-unit-files --state=enabled

You can also filter out information using grep command:
systemctl list-unit-files | grep enabled
systemctl | grep running

How do I see if service named sshd enabled at boot time on Fedora?

Try the following syntax:
systemctl is-enabled {service}
systemctl is-enabled sshd.service
Sample outputs:

enabled

How to see if service is running/enabled on Fedora Linux

systemctl status {service}
systemctl status sshd.service

How do I enable service at boot time?

sudo systemctl enable {service}
sudo systemctl enable sshd.service

How do I disable service at boot time?

sudo systemctl disable {service}
sudo systemctl disable nginx.service

Stop a running service on Fedora Linux

sudo systemctl stop {service}
sudo systemctl stop nginx.service

Start a running service on Fedora Linux

sudo systemctl start {service}
sudo systemctl start nginx.service

Restart a running service on Fedora Linux

sudo systemctl restart {service}
sudo systemctl restart nginx.service

Reload a running service on Fedora Linux

sudo systemctl reload {service}
## edit file ##
sudo vi /etc/nginx/nginx.conf
## reload nginx ##
sudo systemctl reload nginx.service

How to see error messages or logs for given service name on Fedora Linux

journalctl -u {service}
journalctl -u sshd.service
journalctl -u network.service
Sample outputs:

-- Logs begin at Tue 2019-01-08 22:44:44 IST, end at Tue 2019-01-15 01:54:02 IST. --
Jan 09 00:36:41 nixcraft-asus systemd[1]: Starting OpenSSH server daemon...
Jan 09 00:36:41 nixcraft-asus sshd[7826]: Server listening on 0.0.0.0 port 22.
Jan 09 00:36:41 nixcraft-asus sshd[7826]: Server listening on :: port 22.
Jan 09 00:36:41 nixcraft-asus systemd[1]: Started OpenSSH server daemon.
Jan 09 00:46:58 nixcraft-asus sshd[8088]: Accepted password for vivek from 192.168.2.18 port 43104 ssh2
Jan 09 00:46:58 nixcraft-asus sshd[8088]: pam_unix(sshd:session): session opened for user vivek by (uid=0)
Jan 09 00:48:37 nixcraft-asus sshd[8232]: Connection closed by 192.168.2.18 port 43106 [preauth]
Jan 09 00:48:37 nixcraft-asus sshd[8234]: Connection closed by 192.168.2.18 port 43108 [preauth]
Jan 09 00:49:12 nixcraft-asus sshd[8241]: Connection closed by authenticating user root 192.168.2.18 port 43110 [preauth]
Jan 09 00:49:12 nixcraft-asus sshd[8244]: Connection closed by authenticating user root 192.168.2.18 port 43112 [preauth]
Jan 09 00:49:15 nixcraft-asus sshd[8246]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.2.18  user=root
Jan 09 00:49:15 nixcraft-asus sshd[8246]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Jan 09 00:49:17 nixcraft-asus sshd[8246]: Failed password for root from 192.168.2.18 port 43114 ssh2
Jan 09 00:49:32 nixcraft-asus sshd[8246]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Jan 09 00:49:34 nixcraft-asus sshd[8246]: Failed password for root from 192.168.2.18 port 43114 ssh2
Jan 09 00:51:00 nixcraft-asus sshd[8246]: Connection closed by authenticating user root 192.168.2.18 port 43114 [preauth]
Jan 09 00:51:00 nixcraft-asus sshd[8246]: PAM 1 more authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.2.18  user=root

Conclusion

And there you have it, various systemctl commands to list services at boot time running on Fedora Linux. For more information see this page here.