Walstar Technologies Interview Questions and Answers

Search Engine Optimization (SEO) is the process of enhancing a website's visibility on search engines to attract organic traffic.

• SEO involves optimizing website content, structure, and technical aspects to improve rankings.

• Keywords play a crucial role; for example, using 'best running shoes' in a blog post can attract targeted traffic.

• On-page SEO includes optimizing title tags, meta descriptions, and headers for better...read more

A meta title is an HTML element that specifies the title of a web page, crucial for SEO and user experience.

• The meta title appears in search engine results and browser tabs.

• It should be concise, ideally between 50-60 characters.

• Incorporate relevant keywords for better SEO performance.

• Example: <title>Best SEO Practices for Beginners | YourSite</title>

• Each page should have a unique meta title to avoid duplica...read more

SEO tools help optimize websites for search engines, improving visibility and driving organic traffic.

• Keyword Research Tools: Help identify relevant keywords (e.g., Google Keyword Planner, SEMrush).

• On-Page SEO Tools: Analyze and optimize website content (e.g., Yoast SEO, Moz Pro).

• Backlink Analysis Tools: Evaluate and monitor backlinks (e.g., Ahrefs, Majestic).

• Site Audit Tools: Check website health and performance (e.g....read more

HTML tags are used to define the structure and content of a web page.

• HTML tags are enclosed in angle brackets, like <tag>.

• They are used to define different elements on a web page, such as headings, paragraphs, images, links, etc.

• Tags are often used in pairs, with an opening tag <tag> and a closing tag </tag>.

• Some tags are self-closing, like <img src='image.jpg' />.

• Attributes can be added to tags...read more

Bootstrap is a front-end framework for developing responsive and mobile-first websites.

• Bootstrap is a popular HTML, CSS, and JavaScript framework for developing responsive websites.

• It includes pre-built components and styles for creating user interfaces quickly and efficiently.

• Bootstrap uses a grid system to help layout elements on a webpage.

• It also includes responsive utilities for easily adjusting content based on sc...read more

The current version of HTML is HTML5.

• HTML5 is the latest version of HTML.

• It introduced new features like <video>, <audio>, <canvas>, and <svg> elements.

• HTML5 also includes new APIs like Geolocation, Web Storage, and Web Workers.

Bootstrap has four major versions: Bootstrap 2, Bootstrap 3, Bootstrap 4, and Bootstrap 5.

• Bootstrap 2 was released in 2012 and was the first major version of Bootstrap.

• Bootstrap 3 was released in 2013 and introduced a mobile-first approach and a new grid system.

• Bootstrap 4 was released in 2018 and brought significant changes, including a switch to Flexbox.

• Bootstrap 5 was released in 2020 and focused on improving custom...read more

Margin is the space outside an element, while padding is the space inside an element.

• Margin creates space outside the border of an element.

• Padding creates space inside the border of an element.

• Margin affects the positioning of the element in relation to other elements.

• Padding affects the content inside the element.

• Example: margin: 10px will create a 10px space outside the element, while padding: 10px will create a 10px...read more

Semantic HTML elements clearly describe their meaning in a human- and machine-readable way, enhancing accessibility and SEO.

• Examples include <header>, <footer>, <article>, and <section>.

• These elements provide structure and meaning to web pages.

• Using semantic elements improves accessibility for screen readers.

• They help search engines understand the content better.

Event delegation is a technique in JavaScript that allows handling events at a higher level in the DOM tree.

• Event delegation utilizes the event bubbling phase to manage events efficiently.

• Instead of attaching event listeners to individual elements, a single listener is added to a parent element.

• This approach reduces memory usage and improves performance, especially with many child elements.

• Example: Instead of adding cl...read more

React Hooks are functions that let you use state and other React features without writing a class.

• Hooks allow functional components to manage state and lifecycle events.

• Common hooks include useState for state management and useEffect for side effects.

• Example of useState: const [count, setCount] = useState(0);

• Example of useEffect: useEffect(() => { document.title = `Count: ${count}`; }, [count]);

• Custom hooks can be c...read more

Closures in JavaScript allow functions to retain access to their lexical scope even when executed outside that scope.

• A closure is created when a function is defined inside another function.

• The inner function has access to the outer function's variables.

• Example: function outer() { let x = 10; return function inner() { return x; }; }

• Closures are often used for data encapsulation and creating private variables.

• They can al...read more

Two-way data binding in Angular allows automatic synchronization between the model and the view.

• Uses the ngModel directive to bind input fields to component properties.

• Changes in the input field update the model, and vice versa.

• Example: <input [(ngModel)]='username'> binds 'username' property to the input.

• Facilitates easier form handling and validation in Angular applications.