Fix broken links

Author: stwiname

docs/indexer/quickstart/how-it-works.md

@@ -75,7 +75,7 @@ Finally, there are three types of mapping handlers (you can have more than one i
 * TransactionHandlers: On each and every transaction that matches optional filter criteria, run a mapping function
 * LogHandlers: On each and every log that matches optional filter criteria, run a mapping function
 
-The hello-world project has a transaction handler called "handleTransaction" and a LogHandler called "handleLog". These are exported functions that will be explained in the [mapping handlers]((../build/mapping/ethereum.md)) section. When a filter condition is met, the associated handler is called. 
+The hello-world project has a transaction handler called "handleTransaction" and a LogHandler called "handleLog". These are exported functions that will be explained in the [mapping handlers]((../build/mapping/ethereum.md)) section. When a filter condition is met, the associated handler is called.
 
 :::details handlers
 ```ts
@@ -111,7 +111,7 @@ handlers: [
 
 ## The GraphQL schema file
 
-The schema.graphql file outlines the various GraphQL schemas being used. The structure of this file essentially dictates the shape of your data from SubQuery. For more information, click [here](../build/graphql.md)
+The schema.graphql file outlines the various GraphQL schemas being used. The structure of this file essentially dictates the shape of your data from SubQuery. For more information, click [here](../build/graphql/reference.md)
 
 The hello-world project has two entities. A Transfer entity and an Approval entity. Both these entities contain six fields with their associated type such as string or bigint. An exclamation mark indicates that the field is mandatory.
 

docs/indexer/quickstart/snippets/cosmos-mapping-note.md

@@ -1 +1 @@
-Check out our [Mappings](../../build/mappings/mapping/cosmos.md) documentation and get information on the mapping functions in detail.
+Check out our [Mappings](../../build/mapping-functions/mapping/cosmos.md) documentation and get information on the mapping functions in detail.