When you mean “for example,” use e.g. It is an abbreviation for the Latin phrase «exempli gratia». When you mean “that is,” use “i.e.” It is an abbreviation for the Latin phrase «id est». Either can be used to clarify a preceding statement.
I never know which one means what, as it’s not self‐explanative, and I don’t want to focus hard to learn such unusual things, so this plugin really saves my life for those two bits that a re so very often used by English natives.
I remember them by remembering that “eg” sounds like the beginning of example (eg-zample), and I mentally translate i.e. as “in effect” even though that’s not the literal meaning. It’s close enough that if I use it that way, it works.