Study Guide Hub is your pocket-sized companion for technical interview prep and everyday programming reference — built for developers who want to truly understand what they're writing.
Whether you're preparing for a coding interview, brushing up after a break, or learning the fundamentals for the first time, Study Guide Hub turns dense documentation into focused, digestible guides you can actually learn from — anywhere, even offline.
10 STRUCTURED GUIDES
• C# / .NET — type system, async/await, LINQ, generics, memory management, and modern C# features
• Python — data types, closures, comprehensions, OOP, asyncio, and the CPython runtime model
• JavaScript — types and coercion, closures, the event loop, prototypes, and modern ES features
• TypeScript — types, generics, narrowing, utility and mapped types, and strictness
• Java — core language, collections, generics, concurrency, and the JVM
• Go — goroutines, channels, interfaces, generics, and the runtime
• Rust — ownership, borrowing, lifetimes, traits, and fearless concurrency
• C++ — RAII, smart pointers, move semantics, templates, and the STL
• Scala — functional and object-oriented features, collections, and pattern matching
• Angular — components, services, RxJS, signals, routing, and app structure
• Every section pairs clear explanations with real, syntax-highlighted code examples
LEARN BY DOING
• A worked code example on every section
• "In Practice" — see how each concept is applied in real-world scenarios across finance, healthcare, logistics, and more
• Knowledge Check — a quick self-test at the end of every section
FILTER BY DIFFICULTY
• Focus any guide by Beginner, Intermediate, or Advanced
• Skip what you've mastered and drill into what you haven't
QUIZ MODE
• Multiple-choice or flashcard style — your pick
• Spaced-repetition review (SM-2) brings each question back right before you'd forget it
• Grade your recall — Again, Hard, Good, or Easy — to tune the schedule
• Fully offline; your review schedule is saved on-device
PROGRESS & FAVORITES
• Mark sections complete to track your study progress
• Favorite any section for instant access
• Saved locally — no account required
FREE & STUDY GUIDE HUB PRO
• Free: the complete C# / .NET guide, daily quiz practice, and favorites
• Unlock Pro once to open all 10 guides — Python, JavaScript, TypeScript, Java, Go, Rust, C++, Scala, and Angular — plus unlimited quiz and unlimited favorites
• A one-time purchase. No subscription, no account.
100% OFFLINE
• All content lives on your device — study on a plane, on the subway, or anywhere without a signal
DARK & LIGHT MODE
• Follows your system appearance automatically
Available in English and Spanish.
Study Guide Hub is built by Triangulum — a small team of developers who wanted better study tools for themselves.
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