Have personally only ever tweaked stuff/minor injury
Stay away from notoriously shoulder fucking up exercises e.g. Behind the neck press, upright rows, thumbs down/internal rotated lateral raises etc.
Depends how wide you grip but do the majority of your training away from max comp legal grip especially if you tend to flare your elbows.
Program intelligently. Control training variables to minimise chance of injury
Manage fatigue well e.g deloading, eating and sleeping properly