This video will discuss the things we will discuss again in class.
Watch it to familiarize yourself with the terminology.
Then read pages 11-17 The Entity-Relationship Model of a Database
Don't think you have to know or remember everything in both readings.
They are to introduce you to the intro of entity relationship structures.
This is not a required reading. It is optional, but perhaps is one you might want to keep for later reading.
Should you wish to work your way through a course on relational databases