If you are a layman, **“Theory of Everything”** section, **“Newton’s Inverse Square Law of Gravity”** section, **“Bosons and Fermions”** section and **“Entropy”** section would be beautiful. If you also know logarithm, (which you can otherwise learn in “Logarithm”) **“Loop Quantum Gravity”** section, in which I explain my own cutting-edge research, would be also beautiful. If you are eager to understand what special relativity is as soon as possible, read “A short introduction to the history of physics, and string theory as a “Theory of Everything” then the section **“Special Relativity”**, and the section **“Paradoxes in Special Relativity”**

If you are a high school student familiar with the trigonometric functions “Complex numbers and the trigonometric functions” would be very beautiful, after reading “Complex numbers” and “Complex conjugate” as prerequisites.

If you are familiar with the equations of circles, which one usually learns in high school, “Manifold” would be also very interesting.

If you are a student learning high school physics “Electromagnetic forces and time dilation in special relativity” and “Origin of the magnetic force from the perspective of special relativity” would be beautiful.

If you want to learn what matrices are, “Matrices and Linear Algebra” would give you an opportunity to delve into this topic.

If you know calculus and are eager to understand what quantum mechanics is as soon as possible, read “What is a vector?”, “Matrices and Linear Algebra”, “Eigenvalues and eigenvectors”, then “A short introduction to quantum mechanics I: observables and eigenvalues” and “A short introduction to quantum mechanics III: the equivalence between Heisenberg’s matrix method and Schrödinger’s differential equation.”

If you also want to know what quantum field theory is like, you may want to read “What is a Feynman diagram?” If you know special relativity, “4-vector, Lorentz transformation and de Broglie’s derivation of matter waves” would be very beautiful, after reading “Rotation and the Lorentz transformation, orthogonal and unitary matrices” as prerequisites.

If you are a science and engineering students who know Maxwell’s equations expressed using multivariable calculus, I recommend “Differential forms, vector calculus, and generalized Stokes’ theorem” and “Maxwell’s equations in differential forms.”

If you are a physics major, I recommend “What is a gauge theory?”.