Backup. It’s something most computer users – let alone artistic types – never think about, at least not until after it’s too late. Trust me, once it happens to you, it will never be forgotten. Perhaps I can convince you to never have to go through that by recommending you start your backup system now.
All that precious time spent creating, tweaking, and perfecting your masterpiece is well worth a few measly bucks and a bit of effort (which will be automated once it’s all set up) to ensure you don’t lose those hours of hard work.
From 
As I am sure every Illustrator user is aware, you can zoom in and out of your document window using the Navigator palette: either type in a percentage in the lower left, click on the small or large “mountains”, or drag the slider left or right to zoom in or out. However, there is another, easier way to zoom using the Navigator palette…
Here’s a pretty handy little reference graphic: an 
A set of 
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In some previous posts, I rambled on about the 
So you’ve just made a selection in Photoshop using the Marquee tool, but you didn’t start in the right place and one of the corners isn’t covering part of the area you want selected.