Update 01_components.rst

content/developer/tutorials/discover_js_framework/01_components.rst

@@ -288,6 +288,13 @@ The final touch is to let the user delete a todo.
 Owl has a powerful `slot <{OWL_PATH}/doc/reference/slots.md>`_ system to allow you to write generic
 components. This is useful to factorize the common layout between different parts of the interface.
 
+Imagine that you want to display some cards with each the title and a description of a film.
+Clearly, the parent component needs to *define* a content for each card, and each card need
+to *insert* the content given by the parent component. This is done by using the directives
+`t-set-slot="slotname"` (to define) and `t-slot="slotname"` (to insert).
+
+.. tip:: The value of the slot has to be inside the slot tag. Don't forget that t-slot="SlotName"
+
 .. exercise::
 
    #. Write a `Card` component using the following Bootstrap HTML structure: