Lightning Web Component quick reference:
Quick start Trailhead
https://trailhead.salesforce.com/content/learn/projects/quick-start-lightning-web-components
Component library
https://developer.salesforce.com/docs/component-library/overview/components
Dev guide
Playground
https://developer.salesforce.com/docs/component-library/tools/playground
Basic Trailhead
https://trailhead.salesforce.com/en/content/learn/modules/lightning-web-components-basics
Explanation of Targets
https://salesforce.stackexchange.com/questions/243722/lightning-web-components-issue-with-sfdx-push-and-pull
Recipes
https://github.com/trailheadapps/lwc-recipes
