Regarding upcoming MCU films – there are only three currently-announced films (though they will undoubtedly announce more after Avengers: Endgame comes out in April).
Of those three, Captain Marvel is probably pretty likely to stand on its own. For one thing, it’s set in 1995. It’ll contain a few characters who are in other MCU films (most notably a younger, two-eyed Nick Fury), but I’d suspect that any references to other films will be pretty tenuous, if for no other reason than due to the timeline.
Avengers: Endgame and Spider-Man: Far From Home will both, undoubtedly, make extensive reference to earlier MCU films and characters.