I’m assuming that you know that you’re on a site that offers online web development training courses (amongst others) under a paid subscription model? Sitepoint would naturally want you to look into those to see if they would serve you needs, before seeking advice from them and their patrons on where you can obtain similar learning for free.
There are many sites where ‘free’ courses can be found, but you may be limited by the ‘intensive’ criteria you mention. Do you have a reasonably structured idea of what you feel you need to learn so that you can target your learning? If not, you may wish to take a look at this video and give it a bit of thought.