There are several good platforms. WordPress is a popular choice if you want to create your own blog dedicated to short stories. DeviantArt is not just for art but also for sharing written works like short stories. And then there's Smashwords, which is more focused on e - books but can also be a good place to post short stories for a wider distribution.
Well, there are a few places. For starters, you could look at Storybird. It's designed specifically for storytellers and has a nice interface. Another one is Figment. It has a lot of active users and you can get feedback on your short stories. And don't forget about Amazon Kindle Direct Publishing if you want to potentially sell your stories.
First, make sure your story has a clear and engaging beginning. Also, pay attention to grammar and spelling. Use good formatting to make it easy to read.
It varies. Some platforms have auto-posting features enabled by default, while others require manual configuration. Also, it might depend on whether you've given the necessary permissions for automatic posting.
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.