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is there a file around '301 redirect for dummies'? i know one thing i need to know is the .htaccess but i have no idea what to do with it (open it) or whatever needs to be done.
By the way, it used to be that Google considered hyphens to be word separators, but not underscores. So if you had a url like
Google saw "blue" and "widget". But if you had a URL like
Google saw the single words "blue_widget" and "bluewidget" which nobody searches on. So the common advice was to use hyphens.
Google has gotten a lot more sophisticated in how it parses words and in all of the above cases it would probably see "blue" and "widgets"
The other problem with underscores is that they don't show up when text is underlined. So if someone puts your URL in a standard blue, underlined link, someone reading it out can't tell if it's a space or an underline. So that's another strike against underlines.