1. SAP2000 is a structural analysis program used to analyze all types of structures. It can model both skeletal structures like beams and frames, represented using frame elements, and non-skeletal structures like slabs and tanks, represented using area elements.
2. The general steps to analyze any structure in SAP2000 are: enter coordinates, define sections, draw the structure, apply loads, then solve and view results.
3. Key tools for input include editing the grid data to set the coordinate system, defining section properties, and assigning sections while drawing the structural elements.