Merge branch 'crud-and-data-models' of https://github.com/ReCoded-Org/curriculum-backend-readings into crud-and-data-models

Author: osamaakb

module3-crud-and-data-models/r1-schema-and-data-models/README.md

@@ -70,7 +70,7 @@ We will need to send the `dish` data too.
 
 To read resources in a REST environment, we use the GET method. in practice, reading a resource shouldn't change any information - it should only retrieve it.
 
-Note: technically, you can change data in a `GET` request but since we are creating a RESTful API, you shouldn't do that, and, in-general, changing data in a `GET` request would be confusing to the users of your api.
+To read resources in a REST environment, we use the GET method. Reading a resource should never change any information - it should only retrieve it. REST itself is more like a set of guidelines. Technically, you can change data in a `GET` request, but since we are creating a RESTful API, you shouldn't do that. Having a GET request that updates data in your database would be confusing to the users of your API and violate the expected behavior of REST.
 
 ##### Request:
 

module3-crud-and-data-models/r1.1-principles-of-setting-up-your-schema/README.md

@@ -46,7 +46,7 @@ This is not so much a "storage space" issue as it is a "data consistency" issue.
 
 ##### 3. Avoid JOINs and $lookups if they can be avoided, but don't be afraid if they can provide a better schema design.
 
-Having a JOIN or $lookup means you are doing some kind of search in your database for the corresponding field and that operation takes time. So if you embed your data in a single object, you will spare this operation, and your query can be much faster and cleaner.
+Having a JOIN or `$lookup` means you are doing some kind of search in your database for the corresponding field and that operation takes time. So if you embed your data in a single object, you will spare this operation, and your query can be much faster and cleaner.
 
 ##### 4. How you model your data depends _entirely_ on your particular application's data access patterns.