Can somebody explain parts of the game to me? (Mechanics)

Hello everyone,

I am new to the TDF games and I have a hard time understanding some parts of the game. I was hoping somebody could explain the following questions I have.

-Every rider can be specialised in some skills. In the loading screen there are 4 types of specialisations. The first one is a mountain, the second one the time trail, the third one the end sprinter, but what is the fourth one?

-What makes my rider his maximum of the blue bar decrease? Does attacking consume extra maximum of the blue bar, or is it only related to the amount of km driven?

-At what kind of stages, when, and with what kind of rider do you have the highest chances of a successful breakaway? (Without the peleton catching up)

-When should I attack? Flat, uphill or downhill to break loose.

Thanks in advance to the person answering these questions! I hope understanding these topics let me enjoy the game even more