The Autofill feature of Calc, though far less acheived, works in the same way as under Excel:
For example to autofill the days of the week.
- Enter the starting day and move your cursor to the lower-right of the cell.
- The cursor shall change to a small + sign
- Left click/hold and drag along the desired range of cell
- Upon releasing the mouse button the mouse button, all the cell will be automatically filled.