Start with resources that make engineering reasoning concrete. Engineering: A Very Short Introduction is a concise overview of how engineering connects science, design and society, while Structures: Or Why Things Don’t Fall Down builds intuition about materials, stress, failure and structures.
For quantitative energy thinking, Sustainable Energy – without the hot air is especially useful because it forces estimation rather than slogans. For design failure and iteration, To Engineer Is Human helps applicants think about judgement and uncertainty.
For visual and practical explanations, Practical Engineering, The Engineering Mindset, engineerguy and MIT OpenCourseWare cover infrastructure, electricity, everyday artefacts and university-level lectures. Use these actively: pause, calculate, sketch the model, then check what the explanation changed.
For longer-form extension, Engineering Mechanics I, Engineering Mechanics II and Introduction to Computer Science and Programming in Python build mechanics, fluid mechanics and programming fluency. Engineering Matters, The Engineering Commons Podcast and 99% Invisible can help connect technical choices to systems, design and professional judgement.