A launch needs a purpose
Lazzy Birds describes slingshot launches against enemies in a physics-based puzzle and mentions a limited resource without completing that phrase. Read the actual level's allowance before spending an attempt. Then identify what you want one launch to affect. An exposed enemy and a supporting object represent different possible targets, and the useful choice depends on the scene actually presented.
Read relationships in the arrangement
Look for which visible objects touch, support or obstruct others. A launch aimed at one place may change a wider part of the arrangement, but the result needs to be observed rather than assumed. A familiar material appearance does not prove a specific strength. Likewise, the description's special-bird language does not explain an ability, its activation or its effect on a particular structure.
Review the intended contact
After launching, compare the point you meant to reach with the contact that occurred. A trajectory problem calls for a different adjustment from a correct hit that did not produce the expected structural change. Keep that distinction clear when planning another attempt. This note gives a purpose-first approach to the stated slingshot puzzle, not a tested angle, an ability chart or a guaranteed method for defeating every enemy on a level.
Connect a limited launch with the change you want it to create.