The word wissen means to know a fact, and kennen means to know a person or be familiar with something!
Ich weiß, wer du bist.
I know who you are.
Ich kenne ihre Mutter.
I know her mother.
We’ve seen how words like weil, wenn, and dass push the verb from its normal position to the end!
Ich hoffe, dass er mir hilft.
I hope that he helps me.
In statements, was and wer do this too!
Ich weiß, was ihr meint.
I know what you mean.
Ich weiß, wer du bist.
I know who you are.