+2
When I was younger, I liked to watch a movie with a friend, and he brought it to my attention how we always end up talking to each other so at 17, I started watching them alone and really studying. Soon I remember getting a Blockbuster Special Membership where you'd rent one, get one free, so I was watching 5-10 films every single week. After so many movies, you can better identify and be more accurate. Sometimes I can only muster the strength to watch 1-2 movies a week, so I don't wanna watch any junk.
I wouldn't focus on books; that's their perception. Practice. Watch movies on a wide spectrum until you see a correlation, noticing favorite directors, themes, actors, etc etc...
I notice SO many friends who were big movie fans don't ever watch any more. I keep hearing "They're not good anymore" - but at that time I was recommending 70's films. I notice people a little younger than me not being able to sit down for 2 hours. I was talking to a friend while he was watching a movie - I thought "how is that possible"?
Earlier this year I was telling my cousin about a movie, and he sounded so interested, and the more I told about "Birdman of Alcatraz" the more he got interested. I even ordered it via youtube (even though I just saw it), and the minute it came on, before the credits, he had a face like he just saw a dead body. He said to me, "It's black and white?" - never got past the title...
2 weeks ago, I went over a girl's house with "Harry and Tonto" - and she is such a cat lover, which is why I mentioned it in the first place. We didn't get a 1/3 of the way through - constant text interruptions, or having to pause it for phone calls (at one point she told me not to bother pausing it), and then when it started quieting down, she says "It's kinda boring". I asked her about it, she didn't absorb a thing, and she's older than me, so it's not just a "generational" thing. I know there are some teens in here with great taste.