Wade Garrett wrote

I'm replacing the water supply hoses on my washer with stainless steel
braided hoses. I notice some models have a 90 degree elbow at one end of
the hoses.

Do these restrict the flow any?

Yes. but not enough to matter. The washer
at most takes as little longer to fill.

I'm also not sure if the elbow end is attached to the washer or reversed
and attached to the water supply valve. Youtube videos show it both ways.

Depends on where the tap is, that determines what
works best and doesnt see the hose kinked.