You can recategorize and rename topics by clicking the pencil next to the topic title.
Inviting people to a topic is a great way to increase visibility to not only other members but to people outside the forum. To invite people to a topic goto the topic controls -> Share -> Send an invite. From here you can enter either a username or a email address.Read more on the forum here
Trust level 1 (Basic) is where most new user restrictions are lifted. You can now send PMs, upload images and attachments, flag posts, etc.Read more on the forum here
Trust level 0 (New User) is the starting trust level for all new members. Your options for what you can do are fairly limited. You are primarily limited to seeing posts and getting a feel for moving around discourse. Youll gain more permissions automatically as you spend time reading posts and interacting with other members.Read more on the forum here