Simple:
* The dog hid within the bushes.
* The deadline is within the next week.
More complex:
* The answer lies within the pages of this book.
* Within the confines of the castle walls, a secret plot was brewing.
* We discussed the matter within the team.
* She felt a sense of peace within her soul.
Figurative:
* He looked within himself for the strength to move on.
Remember that "within" can be a preposition or an adverb, depending on the context.