As you advance your reading into written news and non-fiction books, you will most certainly come across with i.e and e.g.
i.e. is Latin for "id est," which neatly translates to "that is," or "in essence," or "in other words." Id est has many uses. One of the popular uses is when you are mentioning an idea and to further explain it you can mention "in other words ___" in parenthesis, by saying i.e.
When going to the supermarket use the basket (i.e., the plastic hamper).
e.g. is also Latin, and means exempli gratia. Which translate into "for example." Used instead of writing the dreaded (ex.).
James likes to visit popular parks (e.g., Yosemite, Kobuk Valley).
Both of these are used in academic English extensively, most times in parentheses. To give explanations of the author's arguments or meaning for i.e., and to list examples for e.g.