Server and the use of many collections

Hello,
I’m modeling my Mongodb App collection. I wonder if I’ll need to config another server to manage things like users’ accounts, or if it’s possible to do it directly withing Mongodb.
Also, is there a limited number of collection recommended?

Thanks for your help.

Hello @Ody, welcome to the community.

You can manage user accounts within MongoDB. Here is general information about security within MongoDB and the features: Security.

is there a limited number of collection recommended?

Here is a post about limitations:

Also, general Frequently Asked Questions about MongoDB.