Getting your abbreviations right, Mental Floss provides a tutorial on the meaning and usage of i.e. and e.g.

I.e. and e.g. are both abbreviations for Latin terms. I.e. stands for id est and means roughly “that is.” E.g. stands for exempli gratia, which means “for example.” “Great. Latin,” you’re probably thinking. “How am I supposed to remember that?”
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