I can highly recommend
Basic Photography by Michael Langford and
Digital Photography in Available Light by Mark Galer.
The first one is very in depth and covers everything that you need to know in a lot of detail, probably more detail than you'll actually need to be honest and some of it is a bit technical but you can obviously just read the bits you need and skip the rest. There's only a small part of the book aimed at digital cameras how ever but the majority of the material is relevant whether your using film or digital. You'll probably want to skip the instructions on how to build a dark room though
The second is a similar type of book which again covers pretty much everything but has been written with digital cameras in mind and isn't as technical but has enough info there to get the job done.
If all you want to do is learn what things such as f numbers do then I'd say get the second book but if you want to know what they do, why they do it and how they do it then go for the first.