Point to the item on the screen, press and release the left mouse button.
Right click
Point to the item on the screen, press and release the right mouse button. Clicking the right mouse button displays a pop up menu with various options.
Double click
Point to the item on the screen, quickly press twice the left mouse button.
Drag and drop
Point to an item then hold the left mouse button as you move the pointer press and you have reached the desired position, release the mouse button.