When you want more precise control over when your animations start as users scroll, use the data-aos-anchor-placement attribute. This setting lets you choose which part of an element (top, center, or bottom) should be compared to which part of the viewport (top, center, or bottom) to trigger the animation.

Here are some tips for using anchor placement to fine-tune your animation timing:

• Use top-bottom to trigger as soon as the element begins to enter the viewport;
• Choose center-bottom or bottom-bottom if you want the animation to wait until more of the element is visible;
• Adjust anchor placement for large elements or sections, so animations feel natural and not too early or late;
• Test different anchor placements on various screen sizes to make sure your timing works on all devices.