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Things any user can do
Creating a poll
Creating an event
Cool stuff that requires a Trust Level
If you want to do certain actions in the forum, you need to have earned (or been given by an Admin) a certain Trust Level. Trust Level Permissions Table. Here are some common actions which are helpful to higher level users.
Renaming and recategorizing Topics (TL3+)
First, click the Edit icon near the title of the Topic. Looks like a pencil. Then you can rename the Topic, choose a new Category for it and/or edit its Tags. Click the checkmark icon to confirm your changes.
Moving posts between Topics and splitting Topics (TL3+)
Moderation
Administration
Managing category access and permissions
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Ask questions to the Discourse community
If you have other questions, your first stop should be https://meta.discourse.org/. Create an account there, search their Docs, ask questions.