@Bhanu g77 is a superseded compiler - however, there are options on Windows, let me list some:
- gfortran via MSYS2
- gfortran, lFortran via conda (not an expert myself, but I believe this option currently gives the most cross-platform experience)
- ifx via oneAPI
- gfortran with the Equation.com installer
- The quickstart-fortran installer
However, these questions are not really stdlib related, but more about how to setup an environment for working with Fortran on Windows. For that, can I suggest reading some of the excellent tutorials on the fortran-lang page? E.g.,
The reason package managers such as conda or msys2 (for windows) are so successful is that you can easily install many of the usual developer tools such as CMake or git without having to install each of them separately.