Using quotation marks effectively in Unix

This is pretty basic knowledge but I’ve helped a few people out recently that had been using Unix/Linux for a while and didn’t know and it sure helped me out when I figured it out. If you had asked me how many quotation marks were on a keyboard before I started doing Bash stuff I would have said two. But I, and it seems most non-programmers, often forget the little ` on the same key as the tilde ~ (to the left of the numbers on standard keyboards). So there are actually three types of quotation marks and each one means something different to Unix:

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