Post icons?

I have no clue what most of these mean, but I've got the idea about some of them. Could someone fill me in on what all of them mean, or a guide where I can read about it?

https://gyazo.com/2ba2904363b60873dbf3d53347c3255e

 

Scroll down <3

 

Scroll down <3

Awesome, thanks! Didn't see it there before.

 

Don't worry man, took me forever before I figured it out. Locked was pretty obvious but I didn't know anything else past that before I found this. Also I'm fairly sure bold titles also show new posts but it isn't mentioned up there.

 

There you go! Now you know. Closed!