do red wires must be connected with V+ pins ?
Yes, usually in a 2-wire power system with red and black wires, the red wire is the positive one.
That said, electrons are color-blind, so you should consult the documentation of what you're connecting.
do black wires must be connected with GND ?
None of the labels in your picture say "GND".
If you mean COM, then yes, the black wires for your loads probably do connect to the COM pins. But that's just an educated guess; you haven't provided any documentation for these anonymous "bitcoin miners".
If you're calling the round "earth" symbol between the N and COM terminals "GND", it's better to just call it "earth", since "ground" is a pretty generic term. In this case, the earth terminal lets you use 3-conductor wiring for the AC input side. It's separated from the L and N terminals since it's technically optional, though it's probably a good idea to hook it up. In some countries, it may actually be required.
if I connect red wire with GND
...you will probably blow something up. GND probably connects to black, but again, that's a guess, since nothing in what you've provided says "GND".
is electrically the same thing as 1. and 2. ?
Your English isn't too clear, but as far as I can tell, the answer is "no."