This document provides an introduction to Tumblr for a new user. It summarizes key aspects of Tumblr including: 1) The dashboard is the homepage that displays all posts from followed users; it allows making posts, checking messages, and searching tags. 2) Users can follow other users to see their posts, and can be followed themselves to have their posts displayed on other users' dashboards. 3) Messaging and tags are also introduced, alongside popular fandoms, references to shows like SuperWhoLock, and common Tumblr slang terms. 4) Harry Potter fandom is emphasized as very important to engaging with Tumblr culture.