I agree learning engines is good

Blizzard used Unity to make Hearthstone for mobile devices
http://unity3d.com/showcase/case-stories/hearthstone

I'm sure you've heard of Blizzard (makers of World of Warcraft, Starcraft, Diablo).

Here's some tutorials on Unity

http://unity3d.com/learn/tutorials/projects

http://unity3d.com/learn/tutorials/modules/beginner/2d

http://unity3d.com/learn/tutorials/modules/beginner/editor

http://unity3d.com/learn/tutorials/modules/beginner/scripting

Kerbal Space Program (a pc game)
was also written using Unity

/watch?v=H9fvjKVuULQ
https://www.youtube.com/watch?v=H9fvjKVuULQ

however I disagree that scripting is all you should learn.

You can script Unity with either javascript or C#, so either would be good to learn.

But Blizzard also made their own custom engine for Diablo 3, and they're looking for C++ programmers for it and for World of Warcraft. (They are also looking for java programmers, but that's for their web site, not for games).

http://us.blizzard.com/en-us/company/careers/posting.html?id=13000J5

http://us.blizzard.com/en-us/company/careers/posting.html?id=13000I7

and I'm sure if you looked at other web sites you'd see most openings are for C++. So I think C++ is definitely the way to go.

==================
and A* and pathing is a must if you haven't learned that yet.

/watch?v=KNXfSOx4eEE
https://www.youtube.com/watch?v=KNXfSOx4eEE

2nd part
https://www.youtube.com/watch?v=BG7Bc3C-W-k

http://www.danielsoltyka.com/older-personal-works/a-ogre-3d-demonstration/

http://heyes-jones.com/astar.php

http://justinsboringpage.blogspot.com/2009/02/who-uses-a-code.html

this is a particularly in depth read
http://theory.stanford.edu/~amitp/GameProgramming/index.html

=================

and totally forget the artist stuff

yes, you need to know what textures and sprite bones and animation are, but only so you can program the stuff, but you do not have to be able to draw or use 3ds max

look at the Table of Contents of this book - see chapters 4, 6, 7, 8, 9, 19, 20, 23
http://www.amazon.com/Introduction-3D-Game-Programming-DirectX/dp/1936420228/

you need to know all the "artist" knowledge so you can program it into games

what's a mesh ? how does lightning, shaders, animation work ?

but you need to know it from a programmer's perspective, not an artist's perspective