You can learn more about any command in Maple by looking at its help page. To bring up a help page, type a question mark (?) followed by the name of the command. For example, the following commands bring up the help pages for the Maple solve and plot commands.
> ?solve
> ?plot
If you don't know the name of a Maple command, then you might try the Help Browser or Keyword Search items from the Help menu in the main Maple window.