Usages of osallistua
Minäkin haluan osallistua kurssille, jos siellä on vielä tilaa.
I also want to participate in the course if there is still room.
Hän ei osallistunut eilen, mutta tulee seuraavalla kerralla.
She/He did not participate yesterday, but will come next time.
Elon.io is an online learning platform
We have an entire course teaching Finnish grammar and vocabulary.