If there is one chapter you should photocopy and tape to your monitor, it is the section.
The official RFEM 5 manual is typically divided into logical volumes exceeding 2,000 pages in total. Understanding this structure saves hours of frustration. rfem 5 manual
But six months later, you encountered the problem . A hyperstatic shell structure wasn't converging. A buckling analysis gave you a mode shape that made no physical sense. Or worse, the results looked perfect, but the reactions were off by 40%. If there is one chapter you should photocopy
If you have limited time, prioritize these three specific chapters in the RFEM 5 manual. the results looked perfect