This concludes my informal course in Pascal. You should have a reasonable understanding of the basics of Pascal by now, though this tutorial is by no means comprehensive.
Compiler manuals contain a wealth of information about additional syntactical elements and predefined routines for use in your programs. Here's the Free Pascal Compiler manual. The Reference guide contains information about the system unit which is used automatically with the program, while the units reference manual gives an idea of how many routines there are for accomplishing all sorts of tasks.
Good luck in your future Pascal endeavors! And when you move on to other languages and find yourself using PascalCasing for variable names, remember how Pascal has left an indelible mark on computer programming even though other languages have risen to prominence.