On the left side next to the viewport you find the toolbox. Here you can find the selection tool and thetools you can use to move, rotate or scale objects. The offers a more advanced manipulator that allows multiple transformations simultaneously and is geared towards custom operations on specific objects.
Below these tools you find the viewport tools; one perspective viewport, 1 perspective and 3 orthogonal viewports, and viewport with outliner. In the outliner you can find a list of objects in your scene.