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Sure, here's a summarized HOWTO guide for creating, troubleshooting and managing a systemd service for a Node.js application on Debian-based Linux distributions:

Step 1: Create the systemd service file

Create a new systemd service file in /etc/systemd/system with the .service extension. In your case, the file name would be dayzkillfeed.service.

sudo nano /etc/systemd/system/dayzkillfeed.service

Step 2: Define the systemd service

Populate the service file with the details of your service.

[Unit]
Description=My Service
After=network.target

[Service]
ExecStart=/home/pi/.nvm/versions/node/v18.16.0/bin/node /home/pi/Documents/KILLFEED-DIY-TUTORIAL-2.0-main/index.js
WorkingDirectory=/home/pi/Documents/KILLFEED-DIY-TUTORIAL-2.0-main/
User=pi
Restart=always

[Install]
WantedBy=multi-user.target

Here, ExecStart is the command to start your service. WorkingDirectory sets the current directory of the service, User specifies the user that runs the service, and Restart sets the policy for when to restart the service.

Step 3: Reload systemd manager configuration

After creating the service file, reload the systemd manager configuration to recognize your service.

sudo systemctl daemon-reload

Step 4: Start and enable the service

Start your service with the start command, and enable it to start on boot with the enable command.

sudo systemctl start dayzkillfeed
sudo systemctl enable dayzkillfeed

Step 5: Check the service status

Check the status of your service with the status command.

sudo systemctl status dayzkillfeed

Step 6: Troubleshoot the service

If the service fails to start, check the service logs for error messages.

sudo journalctl -u dayzkillfeed

If your service is still not running properly, ensure your application is working when run manually. If the application works manually but not when run as a service, your service may need additional configuration (such as environment variables).

Also, make sure your application dependencies are up to date by running:

npm update

Remember to modify your service file and reload the systemd configuration if necessary.

Step 7: Viewing service output

To view the service's output in real-time, use the journalctl command with the -f (follow) option:

sudo journalctl -u dayzkillfeed -f

This guide assumes you have a basic understanding of Linux command line, systemd, and Node.js. Always remember to replace dayzkillfeed with the actual name of your service.