There us a lot of great sources for tutorials. Lynda.com charges a membership fee and gives you 24/7 access to their training videos online. They also tutorials on programs for the iPhone and iPad. Not all subjects are covered. Their focus is less on basic and more advanced. What they offer is generally top notch.
Apple quietly offers many tutorials at their Mac Basics portal. These are mostly video tutorials. You can find lots of instructional material for the iPhone at Apple's iPhone Support portal. Apple also offers tutorial videos on their own applications at their Support Videos page. Apple video tutorials are really well made and easy to learn from.
There are many other websites that offer a combination of free and paid tutorials. Some sell CDs or offer downloads, which can be quite expensive. Others offer tutorials where only some of the course material is free. Here are a few places to try:
AtomicLearning.com (free and paid online tutorials)
drycreekphoto.com (free) Resources for Photographers
safaribooksonline.com (books and courses)
Remember that youtube is also a great resource for tutorials on almost anything.