There is also a Jepp video that goes through much of the legend & "how it works" stuff for their materials. We had one in the squadron training shop that you could view if you, um, had to fly someplace that required you to use Jepp charts... yeah, that's it, it wasn't for guys about to interview or anything, no not at all.
You can probably buy the video from Sporty's, or see if your squadron/flying club/local flying school/whatever might be willing to buy it as a resource for those in a similar situation.