Everywhere that you write content in Aamu.app, i.e. comments, tasks, docs etc., can can add internal links with the slash menu:
There you are presented with a dialog window, which has a search input box:
Here my search term is “search for” and it is currently searching for tasks. I can search for any item types in Aamu.app. Switching between tabs can be done with a mouse (obviously), but also with the shortcut Shift + left and Shift + right.
When you click the item that you want to create a link to, this will be added to the document:
It will add a familiar box into the document/comment that you are currently writing.
Clicking the box will take you to that item. Pressing Esc will take you back.
This is how easy it is to reference other items in Aamu.app. You can link from everywhere to anywhere!