hello, I am innocent to Fortran

my respected code gurus, I am new to Fortran language, normally i am using c++, but there are too many code writen by fortran in Physics scientific application , I have to know them , I hope after one or two months , i can understand the fortran source code freely! In the coming days, I hope i will not bother u with silly questions and say thanks to those who will answer my quesiton and give advice to my study!