7.4.3. Manual selection
Sometimes the easiest way to select geometries or entries in the Attribute table is by hand, especially for digitizing or editing tasks. To create new selections use the selection button within the Attributes toolbar. Clicking on the little black arrow to the right, a drop-down menu opens, containing some more options for the selection using rectangles, polygons, freehand forms, or a radius. To select multiple features or to remove some from a given selection, hold the CTRL key (Windows) down while selecting or deselecting the features with the left mouse button (see the manual (QGIS Development Team, 2013) for the same function on Mac and Linux).
Any selection can be removed using the main menu View > Select > Deselect Features from All Layers or the button within the Attributes toolbar.