Thaumcraft 3 has alot to do with magic and the balance of mystical forces. These forces are Vis and Flux. There are Aspects of magic, which are the core parts of Thaumcraft itself. Research and time is needed in this mod. Nothing is obtained easily. Just like with Thaumcraft 2, researching is a process and will take a while for you to research all the parts of the Thaumnnomicon. You must start with the basic knowledge of magic and aspects before you can delv any deeper into this mod.
This is what you need to know: