You asked for five such keys. Here are (in my estimation) the most commonly used:
[Left arrow]
[Right arrow]
[Up arrow]
[Down arrow]
[Home]
The following keys can also be used for cursor control:
[End]
[Page Up]
[Page Down]
[Ctrl]+[Home]
[Tab] & [Shift]+[Tab] (usually function only on web forms)
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mouse
The cursor shows you where the next character will be.
A blinking object to indicate where to type is called a cursor. The mouse pointer is also called a cursor.
That is a cursor - it tells you where text will be inserted if you type text.
The mouse or the touch-pad controls the cursor.