Where to start with pic related?

Greeks. Then Kant. Then Hegel. Otherwise you won't understand it, trust me. He's the only important existentialist other than maybe Heidegger.

>>8464723
Can't I just read a companion or something? I got too many other things on the side.

>>8464733
Not really, no. There aren't any good ones.
I can tell you how to live a Kierkegaardian philosophy in 2 seconds, but I can't prove why you should in that time:

Personal ethics > universal ethics > aestheticism

The Bible.

>>8464733
> I got too many other things on the side

Well, that's just too fucking bad

Either leap in or don't, but don't complain when you don't know what you're reading