Evernote is immensely powerful especially for those in a training role where there is myriad information to be managed.
One of the most powerful ways to organize your information in Evernote is to use note hyperlinks.
Open a Note in it’s Own Window

Double click a note to open it in a separate window, i.e. not the Evernote main window.
Create a Link

Drag and Drop a note title from the main Evernote window
Hyperlink is Ready

A hyperlink to the note dragged into the note open in the separate window is created.
You can click the link to open the linked note in this separate window and then navigate back and forward using the arrow buttons (1)
Build an Index

You can use the technique to build an index to a whole collection of notes like I’ve done for my training sessions.