Page Authoring basics and how to create a simple custom component in AEM is explained in this video. Please check the Prerequisite videos in the playlist.
AEM Tutorial Playlist: https://www.youtube.com/playlist?list=PL5l69Ui6w3V_4naQpzfOC-enLOzcxHm-H
References:
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AEM Core Components Versions
https://experienceleague.adobe.com/docs/experience-manager-core-components/using/versions.html?lang=en
00:00 - Introduction
00:27 - Prerequisites for hands on.
01:12 - Page Authoring Intro
03:11 - Blank Page issue in AEM
05:07 - Page Authoring Basics
10:59 - Custom Component Development in AEM
