You can establish a bidirectional link to another note using the Linking menu
You can also embed a link to another note if you have access to the Super note type. Type the "@" symbol, followed by the name of the note you'd like to create a link to. As you begin typing the name of the note, this will bring up the autocomplete dropdown list. After you select your desired note from the dropdown list, a clickable link to the selected note will be inserted in the current position of the cursor on your note.