There are a bunch of ways to do this, but I’ll start with my two favorites: To quickly zoom in/out without changing tools, press Command-+ (plus sign; PC: Ctrl-+) to zoom in and Command-– (minus sign; PC: Ctrl-–) to zoom out. Another popular way is to switch to the Zoom tool (its icon looks like a magnifying glass, but you can just press the letter Z to get it), then just either click (to instantly zoom in) or click-and-hold (for more of a cinematic zoom) on the spot where you want to zoom in (like I did above), and it zooms in to that area. To zoom back out, press-and-hold the Option (PC: Alt) key and do the same thing (click or click-and-hold), and it zooms back out. As I mentioned earlier in this chapter, you can zoom in to a 100% actual size view by double-clicking on the Zoom tool itself right in the Toolbox.
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