When fortran will be available on sololearn?

Answer 1

I don't know. People have asked about it multiple times. Check this for example:
https://www.sololearn.com/Discuss/94078/?ref=app

You can find more posts using the search bar.

Anyway, you can still request it by emailing them at [e-mail].

Answer 2

I would also to learn Fortran in Sololearn course.