Hello Xue;

I don’t quite understand what the “or rent” part of your sentence means, but for passive income ideas for a budding author/writer, there are multiple ways. E-book publishing, starting a blog and monetizing it in some way — affiliate marketing, digital products, sponsorship, etc. — or even going the non-passive way and ghost writing, copywriting, or any writing. The main thing is you are writing. Any little bit can help you maintain your skillset, improve your vocabulary, and increases your flexibility as a writer.

Hope this helps!