1.Disable root login: Root is the superuser with full privileges on the system. Disabling root login will prevent attackers from brute-forcing the root password. You can still use sudo to run privileged commands.

2.Use strong passwords: Use strong passwords for all user accounts, including the SSH user account. Use a combination of upper and lowercase letters, numbers, and special characters.

3.Use SSH keys: Use SSH keys instead of passwords for authentication. SSH keys are more secure and are not susceptible to brute-force attacks.

4.Use a non-standard port: By default, SSH uses port 22. Changing the default port to a non-standard port will make it harder for attackers to find and target your SSH server.

5.Enable firewall: Enable the firewall and configure it to allow only authorized traffic to the SSH port.

6.Disable unused network services: Disable unused network services to reduce the attack surface of your system.

7.Update regularly: Keep your system up-to-date with the latest security patches and updates.

8.Use two-factor authentication: Consider implementing two-factor authentication to add an extra layer of security to your SSH server.

1.Disable root login: Root is the superuser with full privileges on the system. Disabling root login will prevent attackers from brute-forcing the root password. You can still use sudo to run privileged commands.

2.Use strong passwords: Use strong passwords for all user accounts, including the SSH user account. Use a combination of upper and lowercase letters, numbers, and special characters.

3.Use SSH keys: Use SSH keys instead of passwords for authentication. SSH keys are more secure and are not susceptible to brute-force attacks.

4.Use a non-standard port: By default, SSH uses port 22. Changing the default port to a non-standard port will make it harder for attackers to find and target your SSH server.

5.Enable firewall: Enable the firewall and configure it to allow only authorized traffic to the SSH port.

6.Disable unused network services: Disable unused network services to reduce the attack surface of your system.

7.Update regularly: Keep your system up-to-date with the latest security patches and updates.

8.Use two-factor authentication: Consider implementing two-factor authentication to add an extra layer of security to your SSH server.