Definitely requires the previous films before it. The Incredible Hulk and Iron Man 2 might not be essential, thought the latter did introduce Black Widow. Iron Man, Thor and Captain America: TFA would definitely help. Thor is probably the most important one.
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Top 10 MCU Projects That Would Require Viewings of Past Content
…watch some of those films to understand The Avengers (2012).
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#3
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Agent “tb86” Prime
Avengers: Infinity War
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#4
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Agent “tb86” Prime
Avengers: Endgame
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#5
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Agent “tb86” Prime
Captain America: The Winter Soldier
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Agent “tb86” Prime
3 months ago Report
Captain America: The First Avenger would help and maybe The Avengers (2012) though I think you could follow Winter Soldier fine without that.
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#6
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Agent “tb86” Prime
Captain America: Civil War
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#7
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Agent “tb86” Prime
The Falcon and the Winter Soldier
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#8
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Agent “tb86” Prime
Guardians of the Galaxy Vol. 2
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Agent “tb86” Prime
3 months ago Report
Watching the first Guardians would be necessary but nothing else.
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#9
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Agent “tb86” Prime
The Guardians of the Galaxy Holiday Special
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#10
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Agent “tb86” Prime
Guardians of the Galaxy Vol. 3
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Agent “tb86” Prime
3 months ago Report
The First Two Guardians, Avengers: Infinity War and Endgame, Thor: Love and Thunder's opening (debatable) and The Holiday Special would all be required.