Answer 1

Try the search bar, sometime It helps.
https://www.sololearn.com/discuss/1004596/?ref=app
https://www.sololearn.com/discuss/251180/?ref=app
https://www.sololearn.com/discuss/94078/?ref=app

PDF file links:

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.fortrantutorial.com/documents/IntroductionToFTN95.pdf&ved=2ahUKEwj078XL6b3aAhXBRY8KHYJhDIAQFjAAegQIBhAB&usg=AOvVaw3G62CuJklxS7IAfBOrpbVn
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.mrao.cam.ac.uk/~rachael/compphys/SelfStudyF95.pdf&ved=2ahUKEwj078XL6b3aAhXBRY8KHYJhDIAQFjABegQIBxAB&usg=AOvVaw0pPuh-Eog-EfaHX5Rd1cKm