How do disable vibrate for app notifications for Sony Z5 Premium Dual Sim

I have 3 concerns:
1. How to remove vibrate notification for WiFi whenever there is notif for an accessible Internet?

2. How to remove default vibrate when turning on/off the phone?

3. How do I remove vibrate notification for specific apps like Webtoons, Bookapps, etc?

I already tried checking the specific app notification settings and it's not there. I also tried checking the main settings, disabled the vibrate notification but it still vibrates.