Stop users from directly accessing and using OOTB Lists

Question

There are two type of Users on my Site. Power Users and Normal Users. I want the Power Users to have access to the OOTB Lists and they can do whatever they want with those List and List Items.

However I have created Custom Forms for other Users and they must go through this flow in order to achieve anything. I don't want them to access any OOTB lists.

Answer 1

Give the normal users to the site read access. If they need to contribute list items, then give them contribute access to those lists by granting them contribute access to the site or those individual lists.

Answer 2

As you are using SharePoint server 2016 classic experience, try below suggestions:

Use Audience Targeting on list views:

1. Go to list view page.
2. Edit the page and open List web part settings.
3. Add Power users group in "Target Audiences" under "Advanced" section.
4. This way only power users can see the list view & normal users will not see the list view.

Example:

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Use custom JavaScript:

1. Edit the list view page & Add custom JavaScript using Content Editor or Script Editor web part.
2. In your code, get currently logged in users groups.
3. If user is part of "Normal users" group (Or not part of "Power users" group), redirect to another page.