Marquee Tool is one of the most used tools in making selection.
Without making a selection, you can only make adjustments to an entire layer.
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0:11 Rectangular Marquee Tool
0:40 Elliptical Marquee Tool
0:59 Single Role & Column Marquee Tool
1:26 Add to Selection = Shift [SHORTCUT]
1:55 Subtract from Selection = Option / Alt [SHORTCUT]
2:09 Fixed Ratio
2:18 Fixed Size
2:27 Feather
3:15 Tips
4:20 Deselect = ctrl / cmd + D [SHORTCUT]
4:38 Inverse = ctrl / cmd + I [SHORTCUT]