Tutorial for units

[fitriantoh]

Hi,
I'm a new beginner in Free Pascal.
I've interested to learn it after found Free Pascal for android on:
https://github.com/PascalDevelop/droiddevelop/tree/master/src/PascalDevelop/res/raw

But the big problem is I can't find tutorial about function and how to use of units on units.zip .
So,my question is where I can find tutorial for units?
On that link we can find 'as' and 'ld'.
I don't know those files are urgent or not,because after I read:
http://www.turbocontrol.com/helloworld.htm

I can't find those files on:
http://www.turbocontrol.com/HelloWorld-fpc-2.6.0.arm-linux-052412.zip

Thanks,
Fitrianto H.

[BlueIcaro]

Try to unzip the file with a 7z or winzip programs. Then open it normaly
Zip file is not a lazarus/freepascal file. 
/BlueIcaro

[fitriantoh]

I know if I must unzip it.
But I want to get tutorial for units in units.zip like base64.o or base64.ppu .
Or may be on each unit we can get information how to use it - may be like python?
Thanks...

[fitriantoh]

Solved,coz I found links:
http://www.freepascal.org/docs-html-3.0.0/rtl/index.html

http://www.freepascal.org/docs-html-3.0.0/fcl/index.html

http://www.freepascal.org/docs-html-3.0.0/fclres/index.html