Add concepts page

docs/docs/index.md

@@ -8,6 +8,9 @@ You can create a new PostgreSQL database while setting up Mathesar or use our UI
 
 A live demo of Mathesar is [available here](https://demo.mathesar.org/).
 
+<!-- TODO: Add the advantage of reading the concept page -->
+More about how Mathesar works is covered in the [Concepts page](./user-guide/concepts.md). 
+
 ## Installing Mathesar
 You can self-host Mathesar by following one of the guides below:
 

docs/docs/installation/debian/index.md

@@ -21,7 +21,7 @@ You should have permission to install a debian package
 
 ## Installation Steps
 
-<!-- TODO: remove mmukesh95, improve formatting of code block -->
+<!-- TODO: replace with correct repo URL once assiged by OpenSuse, improve formatting of code block -->
 
 1. Add keys to apt repository.
 
@@ -162,4 +162,4 @@ sudo apt upgrade mathesar
 
 ### 400 Bad request 
 
-If you are getting `400 (Bad request)` when visting Mathesar using a domain name or an IP address, it might be happening due to the domain name not whitelisted correctly. Please follow the instructions for [accessing using a domain name](#configuration).a
+If you are getting `400 (Bad request)` when visting Mathesar using a domain name or an IP address, it might be happening due to the domain name not whitelisted correctly. Please follow the instructions for [accessing using a domain name](#configuration).

docs/docs/user-guide/concepts.md

@@ -0,0 +1,9 @@
+# Conceptual overview
+
+Mathesar provides a spreadsheet-like interface to a PostgreSQL database. Mathesar works by connection to an Postgres server using a database credentials with appropriate [permissions](#permissions) provided by you, inferring the datbase structure by reading through the [catalog tables](https://www.postgresql.org/docs/current/catalogs.html) which we call as reflection and presenting the reflected data in a easy to use UI. We also help the user modify, perform SQL operations using the UI by converting the actions done using to equivalent SQL command and running it on the Postgres database. 
+
+## PostgreSQL permissions {:#permissions}
+
+## Mathesar schemas {:#schemas}
+
+## Reflection {:#reflection}