I have the A6500 and the access to the A7iii, the 6500 has a built-in flash that gets obstructed by the glass which got me into thinking about adding an external flash. I dont really use flash all that much as it is but what would be a good quality flash that is still budget friendly.
My knowledge of flash is knowing the terms: bounce and fill, that is all.
I'm a hobbyist not working in the field so please try to keep that in mind when recommending items.