I opened Blender with the goal of creating a Corgi... I think I failed?

Also, does anyone happen to know of a good Blender 2.8 tutorial series? xD

Been going through Gabriel Gambetta's Computer Graphics from Scratch aaand I'm confused about some

In the included picture... Is the second equation's double bars supposed to signify absolute value or magnitude/length of vector? Context makes it seem like the latter but I thought that was double bars?

The third equation: is there a reason the parens have sharp angles? Why is there a comma instead of a * (multiplication)?

Would appreciate any pointers in the right direction!

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