For quite some time the SharePoint Online „modern“ user experience offered only limited customization capabilities. However, over the course of 2017 and 2018 things have been improved tremendously. Without being an expert developer it is now possible to change colors, the general look & feel, customize page layouts, tweak header & footer, and more. This session dives into the options and shows some frequently requested modifications and extensions (e.g. display the canteen menu using a SharePoint list on a fullscreen display), including how they can be integrated easily.

http://www.spsevents.org/city/Cologne/Cologne2019
Level: DEV (JSON, Site Designs, Site Scripts, Site Themes, Column & View Formatting, SPFx Full Page App, SPFx Application Customizing Extensions: Inject CSS, Inject JS, Footer with Piwik/Matomo/Google Analytics).