If you don’t know how to do something, try to learn by looking for resources. If it’s not possible, then fess up that you don’t know that part because you were never taught that and need some assistance or at the very least need more time to figure it out. No crime in not knowing something. Unless it’s integral part of the position. Like being hired to be a semi driver and not knowing how to drive it. Otherwise no one knows everything

I don’t see how and why you’d be faking something that you getting paid for. How could you even fake it? I don’t understand your friend. It’s a sure way to get fired when they find out you don’t know it but not being honest about it. Nothing good comes out of faking it.

Why would they think you know more than you actually do? Why would they be assuming?

I think you can learn it. Good idea asking people to give you some guidance