Starting the script on reboot

Hi,

I didn't manage to start the script on reboot using 
`   @reboot sudo /usr/bin/screen -dmS story-game /usr/bin/python3 /home/pi/thermal/push3.py`

I wrote `@reboot sudo python3 home/pi/quest_smith/push3.py` instead and it works fine, but I was wondering what -dmS story-game does and what this thermal folder is.

Thanks!