Informal:
* Piece of cake: This is the most common and widely understood slang term for something easy.
* No sweat: This implies that the task is effortless and requires little to no effort.
* Easy peasy: This is a more playful and lighthearted way to say something is easy.
* A walk in the park: This implies the task is simple and enjoyable.
* Child's play: This suggests the task is so easy, even a child could do it.
* A breeze: This term suggests that the task is effortless and smooth.
* A cinch: This implies that the task is very simple and requires no special skill.
* A snap: This term suggests that the task can be completed quickly and easily.
More formal:
* Effortless: This implies that the task can be accomplished without any struggle or difficulty.
* Simple: This emphasizes that the task is straightforward and uncomplicated.
* Straightforward: This means the task is clear and easy to understand.
* Manageable: This implies that the task is within one's capabilities and can be successfully completed.
The best slang term to use will depend on the specific situation and the desired tone. For example, "piece of cake" is a good choice for a casual conversation, while "effortless" might be more appropriate for a formal setting.