They're usually so badly written and baffling that you can't follow it anyway. And of course until you've had some experience of using the software, a lot of it doesn't mean much either. I would recommend trying to read the manual first - at least the preliminary bits. And also get familiar with some of the terms it uses. The other form of documentation is the help functions that are built into the program itself.
Most software has some form of on-line help.
This stuff is very useful and is sometimes more help than the manual. Get to know your way around these features of the software as soon as you can. Keep records Another aspect of documentation is the records you keep. You'd be amazed how often this happens. It's important to keep a log of all this stuff.