You will trip up at the grammar. Japanese grammar is more regular when it is in the MASU form and it is absolutely everywhere when it is in slang. Slang changes from year to year anyway so its very tricky.

If you can't even get it right in the MASU form, you have no chance in slang Japanese? You should know this.

I assume you are having formal Japanese lessons.

You can learn loads of things depending on the manga.
From Fruits Basket I learned: how to make riceballs, some basic Japanese, and enough about Japanese schools to write a manga set in one.
From Death Note I learned: that the end doesn't always justify the means, humans are easily corrupted and no one person can decide what is right and wrong.

Three quoted posts and a reused pic.

To badly misquote the Captain Picard character: "Is there nothing of ThirdSight in what I'm seeing?"

Overdone, I know, but I just couldn't contain myself Koir.

Threads like this make me realize all over again that there's very little hope left.

Next we'll be seeing a "Things I learned from Twilight" thread.

I feel like Nostradamus.