You should just study the opening theory and do the lessons. Unless one of the people who replies to this post is a grandmaster I am pretty sure that we won't be any better than the lessons and theory.
Scotch of Four Knights Scotch?

Four Knights Scotch is better (hmmm I wonder who gave you the idea to make this post haha). You can easily learn all of the plans with GM Daniel Naroditsky’s YouTube Speedruns, just look up “Daniel Naroditsky four knights scotch” and you’ll see plenty of videos.
I want to learn a new opening for white, and the Scotch seems very good. But there are like 2 "variations" or smth, with four knights having both knights being developed and then d4 being played, and regular scotch immediately playing d4 after nf3. I'm just wondering which one is better. Is one more aggressive than the other? Does one have more counters? Also is the scotch gambit good?