Feriale is workdays (and can include Saturday – on the more detailed timetable Fer5 = 5 days Mon to Fri, Fer6 includes the Saturday).
Scolastica is school days (as many schools operate on Saturdays, you need to check the note). Si Effettua al Sabato means it operates on Saturdays. Soppressa al Sabato means it doesn’t run on Saturdays.
Don’t get caught out by the note (Si Effettua nei giorni non di Scuola – Soppressa al Sabato). In other words it operates during school holidays but not on Saturdays.
Festiva is Sundays and holidays (but we knew that).
Gornaliera is daily.
But beware. If in doubt, try asking…