Different martial arts as well as different schools within a martial art teach different curriculums and teach classes differently. The following is an example of what you may expect to learn when you first start attending taekwondo classes.
Terminology. Explanations of some terms you may hear used during classes.
Procedures. Some procedures that may be used during classes.
Techniques. Some techniques that may be taught during the first few classes.
More techniques. Some techniques that may be taught in preparation for testing for the first belt.