I have to hide some lists/Document Libraries / Picture Libraries from the particular user group/members. Eg. I have to hide the Contact Details List from the Editors Group. So how to fix it with OOTB & Custom development for the both the solutions-Farm Solution and Office Online?
On each library you would have to break permission inheritance and remove the editor-group from accessing the library. However, if these users are members och the Visitor Group with read permission, they would still be able to access content with read permission.