You can find the complete overview of educational materials we provided for the Human DeFi Haeck on:
https://humandefihaeck.devpost.com/resources
This is a great resource for everyone getting started with developing æpps and creating their cool projects on the æternity protocol, so feel free to use it even if you are not participating at the hackathon! 
Here is an excerpt of the materials provided:
Node HTTP API
Hosted and auto-generated æternity Node API documentation
SDK Frontend APIs
JavaScript (recommended)
æternal Backend API
æternal is a caching layer and API server for æternity. It is used to respond to queries faster than the node and to support queries that the node cannot support for efficiency reasons.
CLI - Command Line Client
Quickly test all of Aeternity’s blockchain features from your terminal, you can install and use our NodeJS CLI
Sophia Useful links
Webinars
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Basic understanding of Sophia programming language Video Slides
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From product design to Ecosystem Design Video Slides User Persona Interview
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Decentralized team building Miro Team Board