SharePoint has been around for more than 15 years and has grown into a highly complex
beast product with an incredibly wide range of use.
Over that time the web has been collecting tons of information on the topic.
Below is a curated list of authorative resources that I reguarly consult for reference. The list was last updated in Feb 2019.
Architecture & design
- Scalability boundaries in SP Online
- Scalability boundaries in SP on-premises
- Invalid file names and file types
- User profile properties synced
- CSOM API reference
- REST API reference
- SharePoint PnP
- Approved Verbs for Windows PowerShell Commands
- Microsoft Graph Explorer
Networking & ops
- All client side web parts
- Contents of _layouts/15/images (large)
- Search queries
- Search schema management
- Famous SharePoint URLs
Governance and policies
3rd party references
Roadmap & service status
Please DM me on @klinkby with missing links!