Understanding these foundations makes every other programming concept easier. You don't need to know this to write code — but knowing it makes you a significantly better programmer.
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From transistors to programs: binary, logic gates, CPU, the fetch-decode-execute cycle, memory, and storage — all explained from first principles.
Full deep diveWhy computers use binary, how hexadecimal works, two's complement for negative numbers, and how all data — text, images, audio — is represented as bits.
Full deep diveComing soon
Processes, threads, scheduling, memory management, file systems, and how the OS abstracts hardware for programs.
TCP/IP, DNS, HTTP, the OSI model, and how data travels from your browser to a server and back.
Stack vs heap, RAM vs disk, caching, virtual memory, and why memory layout matters for performance.
ASCII, UTF-8, Base64, and how compression algorithms like gzip and zstd make files smaller without losing information.
Encryption, hashing, public/private keys, TLS, and why these primitives underpin every secure system.
Big-O notation, time vs space trade-offs, cache locality, and how to reason about why code is fast or slow.