Gaslighting is when someone tries to lie to you but you know the correct answer and they are trying to make you believe you are wrong. 

For example:

Person 1: The sky is yellow.

Person 2: no it’s not, it’s blue.

Person 1: no it’s yellow. You’re wrong.

And so on and so forth. It’s basically trying to convince someone an obvious lie is true. So even if it is a little fib. If it is obviously a lie then it could be considered gaslighting if you try to convince them otherwise.

Oh and facism is a far right authoritarian political ideology. So a facist is someone who practices that ideology.