Do not, under any circumstances, learn anything about any single spoiler. You have to see this spoiler free.
When others see it and we discuss it, we have to shout in the subject titles that the discussion is full of spoilers (because that will be unavoidable). The people who have not seen it yet have to steer clear of discussion until they see it.
IMO in terms of just plain film quality it is the best Marvel movie. Others might disagree and rank this or that one higher, but, it's certainly in the conversation.