Selecting multiple objects in MS Word is very easy. You just drag along the page and all the objects such as pictures are automatically selected. Is there the same way in Photoshop?
You can select multiple layers by using Shift + click and Ctrl/Option + click.
Ctrl/Option + click selects additional layers individually, Shift + click selects all layers in between and including your current one and the one you click on.
For more info see: Photoshop / Selecting, grouping, and linking layers
No, not on the canvas. But if you want to select everything, simply select the top layer, hold shift and select the bottom layer in Layers panel. There is also an option in Select menu called "Select all layers" for this.
If you want to select layers directly on the canvas, turn on Auto-select (visible on the top right part of Photoshop when Move tool is used).