I am THE Marvel guru so... you’ve come to the right place. Wikipedia often does issue summaries. They don’t have the text of the issue itself but it’s highly detailed. As Aaron said, Graphicaudio, ALL of their books are based on actual comics. Avengers VS X-Men is stunning, Venom: Lethal Protector comes out next week. I stockpiled my knowledge with ComicVine, a website easily findable if you, say, search Captain America (Character) Comic Vine in Google. Also, Comicstorian and VariantComics on Youtube do fantastic work. ComicsExplained is okay but he’s a bit rambly. WhatCulture Comics does fun stuff, and Watchmojo.com has some comics lists. If you’d like to chat Marvel, my skype is Theghostrider132. I’m always looking for fellow Marvel nerds.
Heroes need foes to test them. Not all teachers can afford to be kind, and some lessons must be harsh.