Can you list all of the staff first names please?
select first_name from staff
Can you filter that list to show only the staff with the letter 'a' in their names?
select first_name from staff where first_name like "%a%"
Thank you!  Can you list how many lessons each of those individuals taught?
select count ( * ), t2.first_name from lessons as t1 join staff as t2 on t1.staff_id = t2.staff_id where t2.first_name like "%a%"