A general recommendation of "the one book to get into comics" is bullshit, anyway.
For some, it's gonna be Raina Telgemeier, or a single X-Men issue from 1994, or reading a Scott McCloud book, or webcomics, or a Chinese copy of Maus they found in a hotel room and can't actually understand -- there's no one-book-fits-all.
What "start with Watchmen" communicates is: "I think it's the best one, and my opinions haven't changed since 1995."
How *I* got into comics is essentially impossible to recommend outside of the Netherlands, Germany, Italy, Scandinavia, and 1993 -- Donald Duck comics don't tend to exist in the same way, and you're not learning to read.
How I got into superhero comics is with Ultimate Spider-Man, and though that's aged pretty well, it's extremely 2001, extremely decompressed, and not something I'd necessarily recommend to a new reader in 2019.
Basic questions to ask someone who says they want to get into comics:
* How familiar are you with the form? Do you read any webcomics, or manga?
* What makes you say you wanna get into comics? A recent movie, or TV show? Something you read online?
* When you say you wanna get into comics, what are you talking about wanting to get into exactly? Superhero stuff?
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