The manual can be used to master Fortran 90 and 95 programming methods and techniques. Along with Fortran's presentation, the manual discusses the main programming elements, including, among other things, methods for developing algorithms, rules for writing them in the form of linear circuits, coding technique (writing the source code of the program) and techniques used in testing programs. The manual is equipped with a large number of tasks that can be used both for self-study and for a laboratory workshop in a student group. Designed for teachers, students, graduate students, engineers and scientists.