Using the Help System
Maple has an extremely in-depth help system. To access it, choose Help -> Topic Search. Enter the word you are looking for (e.g., matrix) and you should see a list of topics. Clicking on one will open a "help browser", a window that lets you wander through related topics. We suggest that you "surf" the help system - casually browse, looking at anything that seems interesting. That way you will have some idea of what is available to you in the future.
If you know exactly what you need help on, you may also type (in Maple)
(for example) to get help on the Maple command "simplify".
A very useful feature of the help system is the examples section. Use the Edit->Copy Examples menu command to copy the examples. Then switch to your worksheet (or open a fresh one) and use the Edit->Paste menu command. Now you can execute the examples, and experiment until you are comfortable with the commands.