What is the current status of representations of $GL_n(F)$ (and other algebraic groups)?

When $F$ is a local field, the representations of $GL_n(F)$ are classified by Bernstein and Zelevinsky in terms of cuspidal representations. What about other types of groups (and when $F$ is some other field)? Thank you very much.

Edit: I am interested in the representations which relates to Langlands program.