This presentation was done by the Cyrtene team to go over how to start developing in Lightning.
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Here are the resources link.
Lightning Developer TrailHead
https://trailhead.salesforce.com/content/learn/trails/lex_dev
Lightning Apps Developer Center
https://developer.salesforce.com/developer-centers/lightning-apps/
Quick Start: Lightning App Builder
https://trailhead.salesforce.com/content/learn/projects/quickstart-app-builder
Lightning Aura Components Developer Guide
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/intro_framework.htm