SharePoint limits for the number of per site lists and libraries.

Also look for this Important SharePoint Limit:

How to Remove the 5,000 Items Limit from SharePoint

When a library's item count reaches 5,000, it might become problematic for SharePoint users. You've come to the right place if you've encountered this and are concerned that you won't be able to access or locate your files anymore.

https://www.mrsharepoint.guru/resolve-the-sharepoint-item-limit-threshold/

All SharePoint limits by Microsoft

https://docs.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits