When we send you away to recommended books, products and websites, we sometimes use affiliate links. This appends a tracking code to the end of your link, and if you end up buying something we link to, it gives us a small commission at no additional cost to you.
The reason these books, websites, and products are recommended is because they’re the best resources we’ve found on the given subject. Full stop.
But, affiliate links are a nice way to kick us a little change for making and hosting this free resource (servers ain’t free, it turns out), and our ability or inability to use them does not impact our recommendations at all. To that same point, if you’d rather buy any of these things from a local independent store, or without using an affiliate link, or via a link that benefits charity instead, go for it.