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3+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes sql injection basics, strong params, xss basics.
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Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Rails security basics should teach where data crosses into a trusted interpreter or model boundary. This module covers SQL value binding and dynamic-identifier allowlists, Strong Parameters as mass-assignment shape filtering rather than authorization, and context-aware XSS prevention through escaping, sanitization, safe browser sinks, and defense in depth. Each lesson corrects a common oversimplification and includes a concrete Rails example.
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Topics are ordered for learning. Within each topic, rows are numbered 1–3 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–3 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q3.