Let's assume I know almost nothing about Captain America or Avengers or MCU. I know he has a vibranium shield, and was a product of drinking super-serum during WWII that turned him from a geeky dweeb into a superhero. I'm generally familiar with many other Marvel characters, mostly from this site or reading Marvel's Wikis.
Are there any comics (old time or recent) that I should read first to allow meaningfully better understanding of what is happening in the film, or its enjoyment?
When I say "meaningfully" I mean that the comic adds more information than would simply be imparted by a 2-sentence summary about a character or event on Marvel Wiki.
This includes things that illuminate the backstory, or any film details - even if the comics are in a different non-MCU Earth canonically.