(Makeh B'patish-מכה בפטיש Ep. 27) (#905) Understanding Some of the Rabbinical Restrictions.

Is There a Problem with Spreading Foods (e.g., Peanut Butter, Cheese, Hummus, etc.) onto Challah, Matzah, etc. on Shabbos?;

Understanding the Concept of Leaving an Item on a Tree from Before Shabbos into Shabbos. Some Halachas About Using the Side of a Tree;

is there a difference when opening a bag if the top or bottom is glued or just stuck together without a intermedium in between;