Marvel Recommendations

I've never been into Marvel. I've seen a couple of them, but it's not really my thing. But now I teach a high school video production class with a lot of boys in it. Which of the MCU would you recommend I watch? Which are the best ones?

I've seen Spiderman, Iron Man, Spiderman: Far From Home and Into the Spidervwrse. I watched the first Captain America movie, but I didn't like it. I tried to get into Guardians of the Galaxy, but it wouldn't take.