The iPad can support different keyboards for different languages. Not only will this aid the use in typing in different languages, it will also signal to the iPad which language to use during Speech to Text (Dictation). The iPad provides built-in word prediction.
Resources
Keyboard Shortcuts - These shortcuts will speed up your typing & generally work across all platforms.
Command+A Select all
Command+C Copies selected items
Command+X Cuts the selected items
Command+V Pastes items from the Clipboard
Command+F Displays the Find dialog
Command+N New Tab
Command+S Save
Command+Y Redo an Undo
Command+Z Undoes the last action (if possible)
Command+Space Opens the Spotlight menu
Command+ + Zoom In
Command+ - Zoom Out
Command Hold the command key to get help on other options