Modifiers can include the following:

Chosen Trait: Add or subtract the value of the trait you and your GM chose for this roll as the modifier.

Experience: If you have an Experience (or several) that you think applies to the situation, describe how your Experience helps your chance of success, then spend a Hope per Experience to add its modifier to your roll. The GM might ask you for more information to justify that Experience, but you have final say (within reason) over whether your Experience applies.

Class Features, Subclass Cards, and Domain Cards: Sometimes class features, subclass cards, and domain cards add a modifier to your roll, so keep an eye on your character sheet and cards.

Other Bonuses or Penalties: Add or subtract bonuses or penalties from your equipment, items, or other sources.

Tip: If you consistently use the same Experience on every roll, the GM will likely ask you to narrow the scope of that Experience or change it altogether. Experiences are meant to reflect the way your character has specialized in something important, not give you a bonus to all your actions.