Opening sequence. Build a worker. HOLD ALT press j (adds to the cc control group) press P creates your first cam location
then KEEP HOLDING ALT
and click on you nat on the minimap, press O click on your third on the minimap press I etc
Edennil's more beautified version: "Here is my opening sequence for Core+:

1. On the loading screen:
- Hold mouse in center of screen
- Hold down - (build worker key)

2. When game starts, click on Hatch/CC/Nexus

(2.5 - split workers if you want and send out overlord if zerg)

3. Select hatch/CC/Nexus again if you did step 2.5
- Press and Hold Ctrl-Alt (the modifier for creating camera locations)
- Press 0 (adds to control group 5, my town hall control group. Core+ doesn't have an alternate since ctrl-alt behaves like ctrl when there is no key associated with the ctrl-alt modifier)
- Press P  (creates camera location centered on my main)
- Click natural on the minimap with my mouse
- Press O (creates camera location at my natural)
- Click 3rd base on the minimap
- Press I (creates camera location at my 3rd)
- Repeat these steps for as many bases  as you want. I typically do 6.
- Release control+alt
The differences for regular core:
- Core will hold alt instead of control+alt
- Instead of pressing 0 in the second part of step 3,  you would press J. (Alt + J is an alternate for add to control group 5)
As Jak mentioned, it's in the spreadsheet titled "TheCourse"
Oh, and  as an aside. After I create the bases at my natural/3rd/4th/etc
- Select CC/Nex/Hatch
- Add to control group
- Recreate the camera location to center it on the town hall.
This is helpful for muscle memory when jumping to your base if it is always in the exact same position.
Camera  locations are things you typically will preset  when the game starts. Very rarely will you actually modify your camera locations mid-game.
The rally cam is the exception, and for that there is a difference modifier.

In the case that you  ever do need to modify the other camera locations mid-game on a location that isn't a building or unit, you just need to hold the modifier before selecting the location on the map."