Codecademy is one of the most popular free coding websites for beginners. On their platform, you can learn how to code among other technical skills. If you are a complete beginner and want to learn how to code from scratch, head over to my Free Coding Guide for Beginners to learn the basics of programming step by step. If you're already a developer, Machine Learning Mastery is a resource that can help you start learning what you need to know about machine learning.
Envato Tuts is one of my favourite websites with helpful articles, videos and tutorials for beginners to learn programming from scratch. The best way to learn how to code may involve you coming up with some dead trees a real book that you can follow from start to finish. It takes practice to make each element work on its own, as well as constant testing to ensure that each line of code works with the rest without errors. Even if you are a complete beginner, you can save good money by learning how to build your web application yourself instead of hiring a team of developers to do it for you.
If you don't have any programming experience, freeCodeCamp is a great place to learn the basics and explore different options you could specialise in. There are also some courses that require payment, but for the most part, you could learn a lot just by attending the free courses. The GitHub Learning Lab is packed with lessons created by the GitHub community that cover everything from getting started with GitHub, learning Markdown, creating GitHub pages, uploading a project to GitHub, and more. The command line is a way to "talk directly to the computer using lines of text in a code editor without a GUI (graphical user interface)".
They have several categories to choose from, but if you're looking to learn how to code, you're sure to find the ones that suit you.