diff --git a/documents/markdown/tocs/account-toc.md b/documents/markdown/tocs/account-toc.md
index 741c482..6bbecc6 100644
--- a/documents/markdown/tocs/account-toc.md
+++ b/documents/markdown/tocs/account-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md)  | Accounts Service | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md)  | Accounts Service | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Account Service UI
 
diff --git a/documents/markdown/tocs/auth-toc.md b/documents/markdown/tocs/auth-toc.md
index 53079e7..938f5a0 100644
--- a/documents/markdown/tocs/auth-toc.md
+++ b/documents/markdown/tocs/auth-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | Auth Service | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | Auth Service | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Auth Service
 
diff --git a/documents/markdown/tocs/identity-toc.md b/documents/markdown/tocs/identity-toc.md
index 7533a66..aebd443 100644
--- a/documents/markdown/tocs/identity-toc.md
+++ b/documents/markdown/tocs/identity-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | Identity Service | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | Identity Service | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Identity Service
 
diff --git a/documents/markdown/tocs/index-toc.md b/documents/markdown/tocs/index-toc.md
index b17743d..8d3f67c 100644
--- a/documents/markdown/tocs/index-toc.md
+++ b/documents/markdown/tocs/index-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | Index Service | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | Index Service | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Index Service
 
diff --git a/documents/markdown/tocs/index.md b/documents/markdown/tocs/index.md
index 535ac2b..3db1f5d 100644
--- a/documents/markdown/tocs/index.md
+++ b/documents/markdown/tocs/index.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|Overview | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|Overview | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Welcome
 
@@ -28,10 +28,12 @@ For **client developers** writing application clients that integrate
 with an OPP instance, [the links below](#opp-apis) provide **How-tos**
 and **API references** for the OPP public APIs.
 
-If you are new to OPP, the
-[Getting started](../guides/getting-started.md) guide introduces basic
-platform concepts and provides ready-to-run code examples that will
-get you up and running quickly.
+If you are new to OPP:
++ [Open Permissions Platform Concepts](concepts.md) introduces and
+defines the main concepts and terminology used in OPP
++ [Getting started with OPP](../guides/getting-started.md) introduces
+the OPP APIs and provides ready-to-run code examples that will get you
+up and running quickly
 
 For developers who want to **deploy services** to support their own
 activities in the open licensing domain, we release ready-to-deploy
diff --git a/documents/markdown/tocs/onboard-toc.md b/documents/markdown/tocs/onboard-toc.md
index cbb3dbd..9d0b1a1 100644
--- a/documents/markdown/tocs/onboard-toc.md
+++ b/documents/markdown/tocs/onboard-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | Onboarding Service | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | Onboarding Service | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Onboarding Service
 
diff --git a/documents/markdown/tocs/query-toc.md b/documents/markdown/tocs/query-toc.md
index e584724..93f2a8c 100644
--- a/documents/markdown/tocs/query-toc.md
+++ b/documents/markdown/tocs/query-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | Query Service | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | Query Service | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Query Service
 
diff --git a/documents/markdown/tocs/repository-toc.md b/documents/markdown/tocs/repository-toc.md
index cfdc982..b7815ed 100644
--- a/documents/markdown/tocs/repository-toc.md
+++ b/documents/markdown/tocs/repository-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | Repository Service | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | Repository Service | [Resolution Service](resolution-toc.md) |  [Transformation Service](transformation-toc.md) |
 
 ### Repository Service
 
diff --git a/documents/markdown/tocs/resolution-toc.md b/documents/markdown/tocs/resolution-toc.md
index 50f9b19..6930a81 100644
--- a/documents/markdown/tocs/resolution-toc.md
+++ b/documents/markdown/tocs/resolution-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | Resolution Service |  [Transformation Service](transformation-toc.md) |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | Resolution Service |  [Transformation Service](transformation-toc.md) |
 
 ### Resolution Service
 
diff --git a/documents/markdown/tocs/transformation-toc.md b/documents/markdown/tocs/transformation-toc.md
index dcaa062..285da9a 100644
--- a/documents/markdown/tocs/transformation-toc.md
+++ b/documents/markdown/tocs/transformation-toc.md
@@ -4,7 +4,7 @@
 
 |||||||||||
 |----|---|---|---|---|---|---|---|---|---|
-|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Query Service](query-toc.md) | [Onboarding Service](onboard-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  Transformation Service |
+|[Overview](index.md) | [Accounts Service](account-toc.md) | [Auth Service](auth-toc.md) | [Identity Service](identity-toc.md) | [Index Service](index-toc.md) | [Onboarding Service](onboard-toc.md) | [Query Service](query-toc.md) | [Repository Service](repository-toc.md) | [Resolution Service](resolution-toc.md) |  Transformation Service |
 
 ### Transformation Service