References:

Relativity (Einstein) - Wikipedia

https://en.wikipedia.org/wiki/Theory_of_relativity

Special Relativity - Wikipedia

https://en.wikipedia.org/wiki/Special_relativity

Two Postulates of Special Relativity - Lumen Learning

https://courses.lumenlearning.com/physics/chapter/28-1-einsteins-postulates/

Lorentz Transformation - Virginia Tech

https://www1.phys.vt.edu/~takeuchi/relativity/notes/section08.html

Galilean Transformation - Wikipedia

https://en.wikipedia.org/wiki/Galilean_transformation

Lorentz Factor - Wikipedia

https://en.wikipedia.org/wiki/Lorentz_factor

Time Dilation - Wikipedia

https://en.wikipedia.org/wiki/Time_dilation

Twin Paradox - Wikipedia

https://en.wikipedia.org/wiki/Twin_paradox

Length Contraction - Wikipedia

https://en.wikipedia.org/wiki/Length_contraction

Length Contraction - Wikipedia

https://en.wikipedia.org/wiki/Length_contraction

Relativistic Velocity-Addition - OpenStax

https://openstax.org/books/college-physics/pages/28-4-relativistic-addition-of-velocities

Mass-Energy Equivalence - Wikipedia

https://en.wikipedia.org/wiki/Mass%E2%80%93energy_equivalence

Energy-Momentum Relation - Wikipedia

https://en.wikipedia.org/wiki/Energy%E2%80%93momentum_relation