Some of the best sources are writing - specific platforms. For example, Poetry.com is a great place for poets to post their work. It focuses mainly on poetry and has a community that appreciates the art form. Storybird is another good one, especially for stories. It has a really creative interface that can inspire you while you write and share. Additionally, your own personal website can be a good source. If you have the skills to build and manage it, you can have complete freedom to present your poetry and stories in any way you like.
Well, you could consider posting on platforms like Kindle Direct Publishing or Smashwords if you aim for commercial success. They provide tools and reach for selling your novels. Another choice could be Royal Road, which is popular among fantasy and sci-fi writers for building a fanbase.