Well I think the main things are to get 20-22 defensive skill levels (either 11-11 or 12-10) then passing and rebounding are said to be nice if they are 6 or higher (8+ passing is huge for an SF I think.) then inside shot and jump shot should be 10-11+. As someone else said these are the beginning of this thread but I added a bit more info because I am also trainees SFs so I've asked these same questions.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs