You can use the keyboard to move the cursor forward or backward one character or one word at a time. You can also delete the character or word to the right or the left of the cursor, and you can move the cursor to the beginning or end of a line.
Getting out of an Expression
Move to the end of the next-higher subexpression by pressing Ctrl and Space at the same time.
Press Ctrl+Space repeatedly:
Selecting the Next Placeholder
Select the next placeholder by pressing the Tab key.
Pressing the Tab key:
Press Tab repeatedly:
Select the previous placeholder by pressing Shift and Tab at the same time.
Press Shift and Tab at the same time:
Press Shift+Tab repeatedly:
Move back and forth between complementary positions by pressing Ctrl+5 or Ctrl+%.
First, alternate between a radicand and an index:
Next, alternate between a superscript and a subscript:
Finally, alternate between an overscript and an underscript: