In this section I am casting objectivity to the wind to list the dozen sites that I visit most frequently as a developer. It is likely that at least half of them would be in any developer's Top Ten, but that's not the point here. This is just to introduce you to a small number of sites that I personally find useful, or entertaining, or both I suppose. Some of them have been mentioned earlier in the book.
This is the site that was set up at the same time as Swift was open sourced and is as fascinating as it is essential. There is a lot of stuff here, much of which is perfectly readable for less experienced developers, as well as material for the most advanced of software engineers: