There’s a lot of ways!
You can choose from:
fade (which is the most popular, I use it a lot when the scene happens sometime later) in/out
iris (which looks like a clock, it’s showing that time passed.) in/out
and next ones which I didn’t use yet:
curtain (in_left, out_left, in_right, out_right, in_top, out_top, in_bottom, out_bottom)
You can also choose the colour. The default one is black.
@transition fade out 2
(that’s mean the scene will fade out in 2 sec,)
You can choose whatever (0.5, 3, 0.4). I personally use longer time transitions when it’s a time jump.
I use splash cards as well after the transition (not always) It’s a just random background, and I use:
“The next day”, “Later on” or “Meanwhile” so the reader knows how much time passed.
For flashbacks, it is the best to use white transitions.
Also if you use fast, bright color transitions try to put a seizure warning before it, someone might be sensitive.
Hope this helps!