How to Auto Start a Program on Raspberry Pi?

There are several ways to auto start a program on a Raspberry Pi, as listed in the search results you provided. Here are a few methods:

Using the crontab file:

Open a terminal and run crontab -e to edit the crontab file.
Add a line to the file using the following syntax, replacing with the command to start your program: @reboot <command>
Save and exit the file.

Using the autostart file:

Create a file in the /etc/xdg/lxsession/LXDE-pi/ directory with the name autostart.
Add a line to the file using the following syntax, replacing with the command to start your program: @<command>
Save and exit the file.

Using the /etc/init.d directory:

Create a new file in the /etc/init.d/ directory using sudo nano /etc/init.d/.
Add the following lines to the file, replacing with the command to start your program:

#!/bin/sh
# /etc/init.d/<filename>
<command>

Save and exit the file.
Run sudo chmod +x /etc/init.d/<filename> to make the file executable.
Register the script to run at startup using sudo update-rc.d defaults.
These are just a few of the ways to auto start a program on a Raspberry Pi. The method you choose may depend on your specific use case and preferences.