What is the difference between 나 and 저?
I've learned both these words, kind of, and would appreciate a clarification as to how they are used. Thanks!

Question

What is the difference between 나 and 저?
I've learned both these words, kind of, and would appreciate a clarification as to how they are used.  Thanks!

Answer

나 and 저 are used for informal and formal situations respectively.

내가 - informal, talking with friends, younger people
제가 - formal, taking to older people, authority

나는 - same, but using the "는" distinguishing marker
저는 - same, but using the "는" distinguishing marker

Here is more about 는 은
http://www.talktomeinkorean.com/lessons/l1l9/