You have entered the Gate of Truth, and as such, gained expansive knowledge of Alchemy on the level of using Alchemy without a transmutation circle - Clap Alchemy. Are you disappointed that you didn't lose a limb?
As a result, you gain mastery in the three stages of Alchemy, which are Comprehension, Deconstruction, and Reconstruction. You can understand atomic compositions through Comprehension, disintegrate things through the use of Deconstruction, and alter matter into any form that you understand through Reconstruction.
Naturally you have an advanced understanding of both Chemistry and Alchemical Circles, enabling you to make use of Alchemy in incredible ways with practice.