The Final Fantasy 7 timeline can be convoluted, especially with so many spin-offs, so fans should check out where Crisis Core fits into the story.
CRISIS CORE –FINAL FANTASY VII– REUNION IS MORE THAN A REMASTER - Square Enix North America Press Hub
Where Crisis Core Takes Place in the Final Fantasy 7 Story Timeline
How Much Time Passes Between Crisis Core: Final Fantasy 7 Reunion and FF7 Remake
What Happened To Genesis At The End Of Final Fantasy: Crisis Core?
Final Fantasy VII Rebirth's timeline — catch up before the PS5 launch
Final Fantasy VII timeline, Final Fantasy Wiki
Crisis Core - Final Fantasy VII - Reunion review: polished story filler that's a missed opportunity after FF7 Remake
Crisis Core Final Fantasy 7 Reunion review
Everything you need to know - The only theory post that explains WHY & HOW there's multiple timelines : r/FFVIIRemake