Level 15: Customize the trainer

:orphan:

############################### Level 15: Customize the trainer ###############################

In this level you'll learn to modify the behavior of the Trainer.

.. raw:: html

<div class="display-card-container">
    <div class="row">

.. Add callout items below this line

.. displayitem:: :header: Create and use Callbacks :description: Modify Trainer behavior with reusable, self-contained code. :col_css: col-md-6 :button_link: ../extensions/callbacks.html :height: 150 :tag: advanced

.. displayitem:: :header: Customize the progress bar :description: Create beautiful custom progress bars. :col_css: col-md-6 :button_link: ../common/progress_bar.html :height: 150 :tag: advanced

.. raw:: html

    </div>
</div>