Since there isn't much going on right now, here's a good article explaining the Lions cap situation. Goff has a huge cap number next year, and I knew there had to be good reason for it and there is. They essentially attached a void year to his contract, but with no salary. They can restructure next year and move as much salary to that void year as needed for their contract extension. The Lions have been pretty forward thinking in how they are going to keep their core together.
https://atozsports.com/nfl/detroit-lions-news/jared-goff-restructure-can-help-with-jameson-williams-jahmyr-gibbs-brian-branch/