Depends… Javascript can be used for front end (Ex. React) and server side (controllers) development (node.js). Python is mostly used for server side development. This could also depend on the requirements of a project. I never heard of Python being used for front end development.

JavaScript is an essential part of front-end web development because it allows developers to create dynamic and interactive web pages. With JavaScript, developers can manipulate the content on a web page in real-time, respond to user input, and create animations and effects that make the web page more engaging.

Applying JavaScript to a web page involves embedding JavaScript code within HTML documents or linking to external JavaScript files. Here’s a basic guide to applying JavaScript and an overview of its functions, validations, and events:
Functions are blocks of code that perform a specific task.
JavaScript can be used for form validation, ensuring that user input meets certain criteria before submission.
Events are actions that occur within the browser, such as a mouse click or a keypress. JavaScript can respond to these events by executing code in response.

It takes six to nine months to develop a working proficiency in JavaScript.

Python is great for beginners, ideal for data science, AI, and backend web development. It’s known for its simplicity and wide range of applications. JavaScript is essential for web development, enabling interactive web pages. It’s a must-learn for front-end development and also useful for backend with Node.