As an amateur, I have set up a few small websites over the years, with the use of a now out-dated Dreamweaver 2004MX and some PHP/MYSQL. It would be great to make one or two of the sites "mobile-friendly", and am seeking advice on how to tackle this. In the past I have found text-books on PHP, HTML etc. to be helpful. Are there any books on converting sites to mobile-use which you could recommend? Or perhaps there are particularly clear and helpful websites that you know of that might help.