If this is your first hackathon or if you want to learn a new skill, there are many resources available this weekend to aid your hackathon experience:

HTML, CSS, JavaScript, Java, and Python tutorials - W3Schools Online Web Tutorials

Preparing for your first hackathon - 

https://news.mlh.io/your-first-hackathon-10-07-2013

https://sendgrid.com/blog/prepare-hackathon/

How to build a website on Replit

• How To Build a Website with Replit
• Building a website using Repl.it (YouTube)

How to code a Slack bot on Replit

• https://blog.replit.com/slackbot

How to build a game on Replit

• A Starter Buid to Pygame
• Building a game with PyGame and Replit

How to build a backend using Node.js on Replit

• Node.js coding full tutorial for beginners (YouTube)
• Code a Discord Bot (YouTube)