I thought about make some tabs which can see only website members with a special role or badge. Other users with different role or badge can’t see it.
For example I’ve got a “president” and “common user” role created. There are tabs in menu called: Home, Support and Calendar. Now I wanna make that somebody with a “common user” role cannot see the tab called Calendar in menu in the top of the site, but someone with “president” role can see it and click on it.
Thank you for answers 
Yes it is doable. It wouldn’t be difficult also.
Yes, what Bruno showed you is the minimal requirement, to be able to work with ROLES. For badges you will also find API in the VELO-DOCs (which are even much more expanded and upgraded than the API for ROLES).
However, after you have generated your CODE and also have generated some ROLES inside your Wix-Dashboard contact and member-management…
If you search for some insperations … take a look here…
https://www.media-junkie.com/vnloginmgm
-Navigate to the SETUP-Section
-Go to ROLE-SETUP
There you will find exactly the ROLE-IDs which you have prepared inside your Wix-Role-Dashboard. You can do even more out of this IDEA. 
The same for BADGES—> BADGES are even much more flexible expandable and more efficient. Take a look onto the BADGE-API and you will understand what i mean.
You can create your own DATABSE, where you can store all the informations about a USER or you just try to use the Wix-CRM and Wix-PMD (like i did it)
What would be the ADVANTAGE ? → You would not need a third separated DATABASE → less coding work + more integrability (flexibility).
Wanna see the Contacs and BADGES in ACTION ??? → Click on …
-BADGES…and take a look whats possible…
…or click onto CONTACTS and see what can be done…
Want to get more INFO about this Login-Management-System?
Navigate to the SETUP-Section and click the ABOUT-BUTTON.
Let your IDEAS grow! Have fun!
BTW: Sorry not everything is already working → in developement, but you already can see the futured functions and how everything will work.
