Jesus said:

I am the Way, the Truth, and the Life. No one comes to the Father except through Me.

John 14:6

Jesus claimed many things during his ministry on earth.

What does it mean for Jesus to say He is the Truth? or the Way, or the Life?

He did not say He was one of many truths, or many ways or many lives leading to the Father.

What does it mean for Jesus, a person of the Trinity, to be the Truth?

In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through Him, and without Him nothing was made that was made. In Him was life, and the life was the light of men. And the light shines in the darkness, and the darkness did not comprehend it.

John 1:1-5

Not only is Jesus the Way, the Truth and the Life, but all of reality that we can see and know, everything was made through Him.