Cannot learn 1st rank skills

Hello,
I am playing DK for the first time. I got 70 lvl now and i returned to ebon hold to learn skills as i missed few earlier due to lack of gold. However there are few skills i cannot learn because their rank1 are not available. ExamplesL Heart Strike, Frost Strike, Scourge Strike, Corpse Explosion.
Are there any quest for them or i could only learned them earlier (which would be stupid). I cannot find answer anywhere.
Please help new DK on the server :)

You get those skills from talents. You are unable to purchase the upgrades if you do not have the talent in the specific tree that unlocks them for you.

lol kids these days >_>