Food, weapons, medicine are all needed for fighters and the civilian population alike. Due to the fluid situation on the ground, funds will be used for humanitarian and military purposes as needs dictate. Each donation goes towards the restoration of equal education, democratic rights, and religious liberty for millions of Afghan men and women.
In all Western nations, it is permissible to donate internationally to any group not designated a Foreign Terrorist Organization. To date, we have never received any such designation. Legal precedents exist in the form of the anti-ISIL militias that received U.S. donations in 2015, among other examples; for more details, see here.