How to make and use items?

I posted this in the twine 1 forum by mistake and got an answer for twine 1 but I understand 2 has a diferent format

I am brand new at this. I would like to have an inventory and for different choices to become available depending on what item you have. Like say you get a choice between picking up a dagger or a cake, later on in the game you encounter an event which will change depending on what item you picked up earlier.

Also, I'm told it's possible to change the story format. How do I do this?

Appreciate your help