Suggested Certification for Salesforce Lightning

Salesforce Certified Platform Developer
Recommended Book 1 for Salesforce Lightning

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Recommended Book 2 for Salesforce Lightning

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Recommended Book 3 for Salesforce Lightning

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Recommended Book 4 for Salesforce Lightning

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Recommended Book 5 for Salesforce Lightning

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Interview Questions and Answers

Salesforce Lightning is a component-based framework for app development from Salesforce.com that simplifies processes for business users. It includes Lightning Experience UI, Lightning Components (Aura and LWC), and tools like App Builder for customization without extensive coding.

Lightning offers a modern, responsive UI with drag-and-drop customization, real-time collaboration, and AI features like Einstein. Classic is the older interface with limited mobile support and less intuitive navigation, but both share the same backend data.

LWC is a modern programming model using standard web technologies (HTML, CSS, JavaScript) to build fast, lightweight components. It leverages web standards for better performance and is the recommended framework over Aura.

The Lightning Component Framework (Aura) is an open-source UI framework for building dynamic web apps. It enables reusable components with client-server communication, supporting both mobile and desktop.

Aura uses a proprietary framework with more overhead; LWC uses native web standards for faster rendering and smaller bundle sizes. LWC supports shadow DOM and is easier to integrate with external libraries.

Lightning App Builder is a drag-and-drop tool for customizing Lightning pages, record pages, and app pages using standard and custom components without code, enabling admins to tailor UIs to user needs.

LDS is a set of components and functions that manage data access, caching, and CRUD operations without Apex. It uses wire adapters like @wire to fetch data efficiently and reflect changes across components.

Key decorators include @api for public properties/methods, @track for reactive properties (now @reactive), and @wire for data binding to Apex or Salesforce data.

Use standard DOM events (e.g., onclick) for internal handling or custom events for parent-child communication. Dispatch with new CustomEvent() and listen with event handlers in the parent.

@wire connects components to Salesforce data or functions reactively. It fetches data on load or parameter changes and updates the UI automatically, e.g., @wire(getRecord) for record data.

LMS enables publish-subscribe messaging between components on the same page or across Visualforce/Lightning, allowing decoupled communication without direct references.

Aura events have two phases: Capture (top-to-bottom) and Bubble (bottom-to-top), allowing handlers at multiple levels in the component hierarchy.

Use Locker Service for security isolation, validate inputs, enforce field-level security in Apex, and apply sharing rules. Avoid direct DOM manipulation in LWC due to shadow DOM.

SLDS is Salesforce CSS framework providing UI components, icons, and design tokens for consistent, responsive interfaces across Lightning apps.

Use NavigationMixin in LWC for standard navigation (e.g., to records, objects) or lightning:navigation for Aura. It supports types like standard__recordPage or standard__objectList.

Lightning Connect integrates external data sources (e.g., SAP, Oracle) in real-time without copying data into Salesforce, using OData adapters for external objects.

LTS is a framework for unit testing Lightning components using Jest or Mocha, simulating Salesforce context for isolated, automated testing.

Use @wire for reactive data, lazy loading with if:true directives, minimize DOM queries, and leverage base components. Avoid unnecessary re-renders with @reactive.

@track (deprecated) made objects reactive; @reactive (new) is used for primitive properties to trigger re-renders on changes, improving performance over @track.