"Er kennt alle Tricks."

Translation: He knows all the tricks.

[Rastashredder93]

why not "every trick"?

[SpotXSpot]

I suppose that would be something like "jeder Trick"

[Rastashredder93]

danke mann

[maverickpl]

I put this too. I think it's better idiomatically.

[ApacheDePaname]

And why should we use "kennen" here instead of "wissen" (sorry for the missing Eszett)?

[pont]

As I understand it: "wissen" is for knowing facts; think of it as "I am aware that...". "Ich weiß, dass meine Schildkröte ist verrückt!" = "I know that my tortoise is crazy!". "Kennen" is for knowing people, places, etc. -- think of it as "I am acquainted with...". So, "Ich kenne diese Schildkröte!" = "I know this tortoise!" (also "kennen" for I know this song, this bar, this street, etc.). Native speakers, feel free to correct me!

[itsina]

This is exactly correct. Think of kennen as to be familiar with.