About declaration of interfaces and contracts

[TimeKeyRoll]

Why red is not next to yellow and green...
But RED comes under state variables.

[othaime-en]

Red (VRFCoordinatorV2Interface) is an interface not a contract. So it is not inheritable so it cant be beside VRFConsumerBaseV2 and KeeperCompatibleInterface which we are inheriting.

[TimeKeyRoll]

Absolutely! KeeperCompatibleInterface is also an interface ..nah? if it is not interface then why it is consfusing us with interface name in it?

that's why im confused because two of the imports carry intercace name and one is being not next to others. Why it has a interface name with it? :/

[othaime-en]

Okay for us to register a new upkeep for our contract, our contract needs to be a keepercompatible contract. So here we inherit KeeperCompatibleInterface so that our entire contract is considered keepercompatible as opposed to VRFCoordinatorV2Interface which we just use it to get some functionality from VRFCoordinator.
I hope by now you know the difference between inheriting a contract and using an interface

[TimeKeyRoll]

As I have Understood We're inheriting the KeeperCompatibleInterface in the entire contract because as you have mentioned Contract needs to be keepercompatible. And On the other side VRFCoordinatorV2Interface does not need to be inheriting since we don't need the entire functions of it. am i getting it right? :)

[othaime-en]

Yes. That's a summarized way of putting it.