i.e vs e.g

Happy Birthday, Kirsten! I sure hope you aren't cooking tonight! (Step up, Nathan and Chris)
I know that you and your family place such an emphasis on birthdays so I hope you feel it too.
Hopefully we can manage to get together this week so I can help you celebrate. Happy Birthday!

So, last night at supper when I was receiving my weekly grammar lesson, I discovered that I have been misusing i.e.. Apparently it means 'in other words' and not 'for example'. I don't think I am alone in this error because I've seen it before but I like to learn when I'm wrong. I'm constantly learning!
I don't want to make this a post about when I'm wrong but I never used to get the cliche "Six of one; half a dozen of the other" either. For years I thought it was "six of one half, a dozen of the other" so the context in which people would use it never made sense to me. Apparently, I was wrong but now it all makes sense. I use it all the time. (If you are someone who speaks with me often, you have probably heard me use that cliche. It's because, at 31 years old, it's new to me!)
Now I'll be using i.e. all the time.
There has to be other things out there that people have recently learned that probably should have been more common knowledge. Do tell.