adding a couple of links to API classes

docs/core_classes/overview.md

@@ -1,12 +1,14 @@
 # Core Classes
 
 !!! warning inline end "SageWorks Core Classes"
-    These classes interact with many of the AWS service details and are therefore more complex. They provide additional control and refinement over the AWS ML Pipline.
+    These classes interact with many of the AWS service details and are therefore more complex. They provide additional control and refinement over the AWS ML Pipline. For most use cases the [API Classes](../api_classes/overview.md) should be used
 
 **Welcome to the SageWorks Core Classes**
 
 The Core Classes provide low-level APIs for the SageWorks package, these classes directly interface with the AWS Sagemaker Pipeline interfaces and have a large number of methods with reasonable complexity.
 
+The [API Classes](../api_classes/overview.md) have method pass-through so just call the method on the API Class and voilà it works the same.
+
 ![ML Pipeline](../images/sageworks_concepts.png)
 
 ## Artifacts