I really have a stupid question, it’s not about me but about my father (a little older and 100% blind).
Is it possible to control Audacity using the keyboard? For example, setting the mark (start / end) and cutting the marked audio section accordingly?
Please see this page in the Audacity Manual: https://manual.audacityteam.org/man/accessibility.html
And this page shows all the available factory preset keyboard shortcuts: https://manual.audacityteam.org/man/keyboard_shortcut_reference.html
I highly recommend the “audacity4blind” mailing list for blind users of Audacity. There are some very knowledgeable people on that mailing list with specialist knowledge of Audacity’s accessibility features. https://wiki.audacityteam.org/wiki/Audacity_for_blind_users#Documentation_and_mailing_lists