Demos for Trailhead Live sessions
For Visualforce the files are just text files with the source code for the Visualforce pages and - if using a custom controller or controller extension - the Apex classes. To use just create your own Visualforce page and copy/paste.
The LWC demos are in a format suitable for adding directly into a MS VS Code project.
Here's a list of Trailhead Live sessions to date:
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Preparing for Your App Builder Cert - Salesforce Object Relationships https://trailhead.salesforce.com/live/videos/a2r3k0000014vFG/preparing-for-your-app-builder-cert---salesforce-object-relationships
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Preparing for your App Builder Certification: Lightning Platform Security Model Summary https://trailhead.salesforce.com/live/videos/a2r3k000001WFkZ/preparing-for-your-app-builder-certification-lightning-platform-security-model-summary
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Preparing for Your Platform Developer I Cert - Working with SOQL https://trailhead.salesforce.com/live/videos/a2r3k0000014vF6/preparing-for-your-platform-developer-i-cert---working-with-soql
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Preparing for your Platform Developer I Certification: Apex Triggers https://trailhead.salesforce.com/live/videos/a2r3k000001WFkP/preparing-for-your-platform-developer-i-certification-apex-triggers
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Preparing for Your Platform Developer I Cert - Apex Testing https://trailhead.salesforce.com/live/videos/a2r3k0000014vDo/preparing-for-your-platform-developer-i-cert---apex-testing
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Preparing for your Platform Developer I Certification - Visualforce Part 1 - Standard Controllers https://trailhead.salesforce.com/live/videos/a2r3k000001n1zy/preparing-for-your-platform-developer-i-certification---visualforce-part-1---standard-controllers
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Preparing for your Platform Developer I Certification - Visualforce Part 2 - Custom Controllers https://trailhead.salesforce.com/live/videos/a2r3k000001n203/preparing-for-your-platform-developer-i-certification---visualforce-part-2---custom-controllers
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Preparing for your Platform Developer I Certification - Working with DML https://trailhead.salesforce.com/live/videos/a2r3k000001n2Kh/preparing-for-your-platform-developer-i-cert---working-with-dml/
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Trail Together - Asynchronous Apex
https://trailhead.salesforce.com/live/videos/a2r3k000001n2G6/trail-together---asynchronous-apex -
Preparing for your Platform Developer I Certification - Lightning Components
https://trailhead.salesforce.com/live/videos/a2r3k000001n2LQ/preparing-for-your-platform-developer-i-certification---lightning-components -
Using Upsert with External ID in Salesforce
https://trailhead.salesforce.com/live/videos/a2r3k000001n2dP/using-upsert-with-external-id-in-salesforce -
Preparing for your Platform Developer I Certification - Deployment: Environments and Tools
https://trailhead.salesforce.com/live/videos/a2r3k000001n2jD/preparing-for-your-platform-developer-i-certification--deployment-environments-and-tools -
Triggers - Sometimes you need to turn them off!
https://trailhead.salesforce.com/live/videos/a2r3k000001vDVP/apex-triggers--sometimes-you-need-to-turn-them-off