Here you can find some tutorials I occasionally put online for my
Text encodings ("codepages"): an interactive tool to
see many of the several text encodings in action, with their serialization forms and conversion
issues. You can experiment converting a codepage into another, or seeing the bytes
representing some text, or enter some bytes and get the corresponding text.
Base converter: convert integer numbers into different
numeric bases (decimal, binary, hexadecimal, octal or any custom base of your choice).
Just type a number (using 0-9 digits and letters as appropriate) and get the equivalent
number representation in all the other bases.
XSLT: play with basic XML transformations using XSLT: use
some predefined XML and XSLT samples, or just type (or paste) your own and see