What is the best platform to learn the basics of Web Development for a complete newbie?

Hands down one of the best platforms to learn the basics of web development. Easy to use, free up to an extent, and an extremely simple walkthrough. There are of course other platforms, but this is my personal recommendation and arguably gave me all the foundations for my current job.

Codecademy is by far the most newbie friendly platform for basic webdesign. The courses are very well structured starting from basic syntax and working your way up to more advanced concepts in short and rewarding lessons. What I especially like about it is the built in console and text editor which is easy to use and you can freely experiment with different variations of code in the same lesson. The general idea of the website is learning by doing. The paid version also offers you the chance to work on more advanced projects with some of their programmers.

Learning feels like playing a game while building knowledge. Lessons are interactive and supported with good real-life examples at the end of the lesson.

Treehouse brings affordable technology education to people everywhere in order to help them achieve their dreams and change the world.

Super nice mix of tutorials, quizzes & access to the community. Good learning path

This is most comprehensive, easy to learn, experiment and experience the progress. Also they have certification which is great.

The interactive learning destination for aspiring and experienced developers

I think you should decide the languages you are going to learn and then buy different udemy courses for $10 each when they are on discounts (every few weeks) and you can have 10s of hours of programming courses that way

For me it's Pluralsight. You can find there courses from many topics and you can filter by level of your knowledge. Later when you advance you don't have to switch platform. I learned there a lot when I was developing my own startup and had to use technologies I never worked with before. You can became an expert overnight (or something close to that :) They have 10 days free trial and you can search and browse courses even when you don't have an account yet to have a sneak peek to what you'll be paying for.

Quick Code has a collection of free course. This will help you to find the best course for the programming language you want to learn.

Tutlane.com is the best site which offers free programming tutorials from basic to advanced level.

I would suggest to try this one. It developed especially for the Junior developers, it will guide you step-by-step!