I've always thought of the following movies and TV shows as one big Marvel universe. I call it the 2000's Marvel Universe.
X-Men
X-Men 2: X-Men United
X-Men: The Last Stand
X-Men Origins: Wolverine
X-Men: First Class
The Wolverine
X-Men: Days Of Future Past
Deadpool
X-Men: Apocalypse
Logan
Deadpool 2
Dark Phoenix
Spider-Man (2002)
Spider-Man 2
Spider-Man 3
Blade
Blade 2
Blade: Trinity
Fantastic Four (2005)
Fantastic Four: Rise of the Silver Surfer
Ghost Rider (2007)
Ghost Rider: Spirit of Vengeance
The Punisher (2004)
Punisher: War Zone
Daredevil (2003)
Elektra (2005)
Man-Thing (that really terrible movie that nobody knows exists. Look it up)
TV Shows
Legion
The Gifted
Short Films
No Good Deed
Dirty Laundry (a short SDCC film about the Punisher)
Every movie besides the newer X-Men movies take place before the Sentinel War depicted in X-Men: Days of Future Past. You may be asking, "If the mutants are such a big part of the X-Men franchise, why are they never mentioned in these other movies?" My answer to that is that they just don't show them being mentioned. I think that the general public assumes Spider-Man and the Fantastic Four, who are popular heroes in this universe, are mutants. Superheroes like Daredevil, Elektra, Ghost Rider, Blade, and Punisher, operate on the down low, so not a lot of people would know about them. And the X-Men also kind of operate on the down low, until the revised timeline. I think all of the other heroes, besides the X-Men, died fighting the Sentinels, and when the X-Men reset the timeline, they would all either come back to life or not exist at all. I'll leave that decision to you guys. If their are any errors or continuity problems I missed, please let me know. I just joined and I'm so glad I can finally talk to people about this!