Reference library

• HTML elements and page structure — A quick guide to document landmarks, headings, paragraphs and the meaning carried by common HTML elements.
• HTML attributes, links and images — Use attributes to give elements destinations, names and text alternatives that communicate their purpose.
• CSS selectors and declarations — Read selector rules and choose a clear target for reusable visual styling.
• CSS layout with Flexbox and Grid — Choose Flexbox for a one-dimensional arrangement and Grid when rows and columns need coordinated placement.
• JavaScript arrays — Keep a sequence of related values in an array and select an item by its zero-based position.
• JavaScript functions — Name a reusable operation with a function, give it clear inputs and return a value when a caller needs one.
• JavaScript and the DOM — The Document Object Model represents a page as nodes that browser code can find and update in response to an action.
• TypeScript basic types — Use basic annotations and inferred types to describe the values a small program expects.
• React props — Props pass read-only inputs from a parent component to the component that presents them.
• React state — State lets a component remember information that can change after a person interacts with the interface.
• Python lists and dictionaries — Lists preserve an ordered sequence; dictionaries connect unique keys to values for named lookup.
• SQLite query basics — Select only the columns you need, filter rows with WHERE and specify a predictable result order.