Okay, a little inside Burkey here.
Beginning of each Bundesliga season I check about five things: Who did Dortmund get under 23, who did Bayern let go under 18, who did Chelsea let leave for anywhere, what PSG projects aren't worth the $1.75B in youth loss they have already had, and what does Ajax do, in general?
I start there, then I look at Leverkusen, Red Bull's system (like Sesko, Haaland, Keita, etc.) the Madrid clubs, Barca, and Benfica.
Specifically U-23 and U-17.
bundesliga.com also gives a good "top 5 emerging players each year" list.
But, pay attention to those programs, and you'll be fine.