Moving by characters
To move one character to the left, you either use the arrow key, or the h command. The l command move to the right.
The j and k commands move one line down and up, respectively.
To help you remember which key move in what direction, think of h being the leftmost key among these, and l the rightmost. The j key can be thought of a downward pointing arrow, and, with a little imagination, the lowercase k is pointing upwards.