Classic Question about tanking

So I have been playing Wraith classic but I know that I want to play retail. I am just undecided which class I want to play. I do know however that I am interested in playing a tank. In FFXIV I used to main as an Astrolgian (Healer) and a Dark Knight (Tank). My question is are Tanks needed and how hard is it to tank in WoW? Is there any tips and tricks I need to know to survive or is it pretty simple via /r/wow https://ift.tt/uKqtrb4