If I need to list a series of numbers from $1$ to $50,$ what is the correct way?

In any cell, type $1,$ place cursor on the fill handle and hold onto Shift. Drag the fill handle down until you see $50,$ then let go of the mouse click before letting go of the Shift.

In any cell, type $1,$ place cursor on the fill handle and hold onto Ctrl$.$ Drag the fill handle down until you see $50,$ then let go of Ctrl before letting go of the mouse click.

In any cell, type $1,$ place cursor on the fill handle and hold onto Shift. Drag the fill handle down until you see $50,$ then let go of Shift before letting go of the mouse click.

In any cell, type $1,$ place cursor on the fill handle and hold onto Ctrl$.$ Drag the fill handle down until you see $50,$ then let go of the mouse click before letting go of the Ctrl$.$