Learn Lightning Web Components

To create Lightning web components for use in LWC Offline-enabled mobile apps, you must learn the basics of Lightning web components.

Lightning Web Components (the name of the framework) was introduced in 2018, and represents the best, most performant, and most modern framework for building custom apps for Salesforce. Learning Lightning web components lets you build apps for desktop, mobile online, and mobile offline environments.

Learn Lightning Web Components with Trailhead

If you’re not already an experienced LWC developer, the best way to learn Lightning web components is with the extensive collection of lessons and projects on Trailhead.
Learn Lightning Web Components with Documentation

Use the Lightning Web Component Developer Guide to understand the Lightning Web Components framework and how to use it with Salesforce.