Hi Brian,
The colours and strikethroughs are ‘tracked changes’ basically:
A red strikethrough means the text has been removed from the final version
A green strikethrough means the item has been moved to elsewhere in the document.
Sometimes things can get a bit confusing to read, as for example the bullet point may have a strikethrough because the line above was deleted, but the line above’s bullet is still there, still forming 1 line total (if that makes any sense!)
Not dumb at all – I only learned to work with tracked changes fairly recently too!
Cheers,
Mark