Goodreads
Goodreads asked Andrew Seiple:

What’s your advice for aspiring writers?

Andrew Seiple Stephen King wrote a book called "On Writing". Grab it! For less than $10, you'll get some of the best down-to-earth advice a writer could have.

Aside from that... the other advice I could give you is don't be afraid to practice. There are plenty of fanfic or writing forums online, where you can try out different things without any real consequence. Go for it! No one gets a fully-written book without a lot of practice.

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