请教高手： What I learned is...

Are the following Grammarly correct? Can someone use " is " and "can " in the first sentence after a paste tense of "learned":

What I learned is that the process of transforming ideas into reality can be extremely difficult without conscious and deliberate effort.

 

I know the following is correct: 

What I have learned is that the process of transforming ideas into reality can be extremely difficult without conscious and deliberate effort.