There are four important points to clear up regarding e.g. and i.e.:
- They are not the same thing, nor can they be used interchangeably.
- You should never add “etc.” after either one.
- They don’t need to be italicized.
- You should put a comma after e.g. and i.e.
In case you’re wondering, e.g. is short for exempli gratia; i.e. is short for id est. They’re both from Latin.