Link to other lists
The fast way to link to other lists is to type "[[". A search prompt will appear, and after entering a search term and selecting a result, a formatted link is inserted for you.
Alternatively, you can get the link to an item by selecting the "Get link" option in the menu, and paste it elsewhere.
Find references of an item
To find all references of a particular item, you can choose the "Show all references" option in the node menu.
The shortcut for "Show all references" can be customized.