I have summed up my roadmap to becoming a Web Developer in less than 500 words. If you are looking to get started with Web Development, I'd strongly recommend you to check this out.
This blog has all the basics of CSS Flexbox along with the code snapshots and screenshots of the outcome. Again, if you're a beginner, this is for you! Check it out.
JavaScript supports 3 function borrowing methods, each of which have been covered in detail in this blog. Strongly recommended if you want to dive deep into JavaScript concepts.
Understanding CSS selectors and their specificity is bread and butter for a UI Developer. Every Frontend Developer should definitely read this once.
No complex web app is completed without some or the other sort of asynchronous behaviour. If you're into asynchronous JavaScript, chances are that you already are familiar with Promise APIs. If not, now is the time.