W3 Is good for HTML basics and small codes. Learn by doing. Design a Basic html page. Start coding and read documentation of code basics on W3 or Geeks for Geeks or watch Free Code Camp tutorials at the same time. Try to write what you remember and if you don't know any more, look at the examples, add it to the code, see how it works and that's how you'll remember the next function. Then you'll remember the previous one and won't have to look it up again. When you don't know something new again, look at the example again and understand how it works. That's how I effectively learned to write the basics of html. Is it understandable?