Make restrictive acces for specific users so they can only see specific topics

The access control is based on Forums, not topics. People can see and be restricted for each forum topics separately, not for each topic. you just need to move visible/public topics in a public forum.

Make notifications for specific users so they only get notifications for the topics they're part of

Just check this option and users will be automatically subscribed to topics they've posted:

https://wpforo.com/wp-content/uploads/2017/08/wpForo-automatic-subscription-to-topic.png

I've just installed wpforo and i'm looking for 2 specific features which will enable me to choose this forum for future use professionally. 

I need to be able to : 

Make restrictive acces for specific users so they can only see specific topics

Make notifications for specific users so they only get notifications for the topics they're part of

Can someone please clarify how to do this? 

thank you so much and have a good day!