The enormous amount of historical data and records now available online have changed the approach and rapidly reduced the amount of time and cost required to research your family tree.
Some family history research books now seem quite dated and don't reflect the latest techniques available. Other books about online research seem to be simple directories of relevant websites. Family tree programs often include manuals on how to use the program, but not how to do the research itself.
I found this book very easy to read and well presented. It walked through the process of how to use the various online databases to build your tree. Not everything can be done online of course, and the book explained where to draw the line. To me this would be a good, straightforward introductory book ideal as a gift (or for yourself) for someone about to start on their research.
Specifically appropriate for UK readers, although references to other countries records is included.