Layer content can be aligned on the page accurately using the Alignment commands.
Settings can be adjusted from the Alignment pop-up panel on the Toolbar:
For aligning layer content across multiple layers, settings can also be adjusted from the context toolbar, but always in relation to selection bounds:
When enabled, alignment handles appear as you drag content, allowing you to place it precisely by lining it up in accordance with other content in your document. Alignment handles are especially useful for aligning the edges or centers of multiple selections to other page content or guides.