You can read A Brief History of Time a dozen times, but you won't truly understand time dilation until you’ve calculated the Lorenz factor for a high-speed muon. Physics is a "doing" subject. Working through a structured set of 300 problems allows you to:
Before tackling the heavy lifting of General Relativity, you must master SR. Problems typically cover: Moving between inertial frames. Relativistic Momentum and Energy: Understanding in a practical context. You can read A Brief History of Time
Use the problems alongside classic texts like Hartle’s Gravity or Carroll’s Spacetime and Geometry . Finding the Resource Problems typically cover: Moving between inertial frames
Move beyond the "bowling ball on a trampoline" analogy to actual geometric calculations. Finding the Resource Move beyond the "bowling ball
Calculating how light loses energy escaping a gravity well.
Transition from basic algebra to the complex world of tensors and Christoffel symbols.
Drawing Minkowski diagrams to visualize worldlines.