Eg I heard he wanted only a road to the unattached German territory
Annexation free city Gdansk/Danzig and whole Pomerania (Poland can't agree this would mean being cut off from Baltic sea and losing their port in Gdynia.) Poles were majority in Pomeranian and Gdynia was very modern city build recently by poles to access sea trade routes.
All those demands was only excuse to attach Poland. Hitler wanted revenge on France, but if that would happen Poland would attack on his unprotected east border and he would lost war.
He knowed France would not help Poland so he attacked it first and later France.