https://siril.org/
https://gitlab.com/free-astro/siril-scripts
https://youtu.be/YY-kWcJ6lyQ
https://youtu.be/s6Ijm36p01A
C:\Program Files (x86)\Siril\scripts
This video explains step-by-step how to use a script to get your FITS files into Siril to begin the post processing procedures. Easy starting point.