https://youtu.be/Oi45D1r1DUs

In this tutorial, we will showcase and talk about following topics:

• Themes and parent themes (link to Create ScandiPWA App documentation)
• File overrides (link to Create ScandiPWA App documentation)

As well as from this documentation:

How to override JavaScript classes?

How to override non-classes?

How to override styles?

Overriding index.html and index.php