This is the 375th most frequent Finnish word.
lopulla
"At the end" or "in the end."
'lopulla' refers to 'at the end of' in this case, specifying the latter part of the year.
Vuoden lopulla sää muuttuu kylmemmäksi.
At the end of the year, the weather becomes colder.
Here, 'lopulla' indicates 'at the end of', pertaining to the course's conclusion.
Kurssin lopulla opimme soveltamaan oppimaamme käytännössä.
At the end of the course, we learn how to apply what we have learned in practice.
'lopulla' in this context means 'towards the end of', describing the latter part of the day.