This document discusses different types of ABAP reports including control break reports, ALV reports, and techniques for working with internal tables. It provides examples of control break reports using AT FIRST, AT NEW, AT END, and AT LAST to group and total data. It also demonstrates how to generate ALV grid and list reports using the REUSE_ALV_GRID_DISPLAY and REUSE_ALV_LIST_DISPLAY function modules, as well as how to customize ALV reports by adding fields, joining tables, and using variants.