which class/role is mostly needed for high end raid

Hi ppl
so i unsub from Blizzz acc for Vanilla on Nost, its really NICE to see old content, i was amazed when i saw ur old Org
After many some years of HC raiding expecially in TBC, i decieded to move here, i was a tank/healer and dps too.
so the question is for you Nost ppl, which class / role should i lvl which are needed for raiding ...
TY in advance
so i unsub from Blizzz acc for Vanilla on Nost, its really NICE to see old content, i was amazed when i saw ur old Org

After many some years of HC raiding expecially in TBC, i decieded to move here, i was a tank/healer and dps too.
so the question is for you Nost ppl, which class / role should i lvl which are needed for raiding ...
TY in advance