I'm glad you're interested in learning about backend development with JavaScript. It's a great field with a lot of potential for growth.

Here's a roadmap that you can follow to learn the basics and then progress to more advanced topics:

Basics

• Start by learning the basics of JavaScript. This includes syntax, variables, functions, objects, and arrays. There are many great resources available online and in libraries that can help you with this.
• Once you have a good understanding of the basics, learn about HTTP requests and responses. This will give you a foundation for understanding how web applications work.
• Next, learn about databases. This includes both relational databases (SQL) and NoSQL databases (MongoDB). There are many different databases available, so you'll need to choose one that's appropriate for your needs.
• Finally, learn about web frameworks. These are pre-made libraries that can help you build web applications more quickly and easily. Some popular web frameworks include Express.js and Sails.js.

Intermediate

Once you have a good understanding of the basics, you can start to learn more advanced topics. This includes asynchronous programming in JavaScript, unit testing and continuous integration (CI), deployment and hosting, and security in web applications.

Advanced

If you're interested in pursuing a career in backend development, you'll need to learn more advanced topics. This includes microservices architecture, cloud computing platforms, big data and machine learning, and DevOps principles.

Resources

Here are some resources that you can use to learn these topics:

• Mozilla Developer Network: https://developer.mozilla.org/en-US/docs/Web/JavaScript
• Node.js: https://nodejs.org/en/
• MongoDB: https://www.mongodb.com/
• Express.js: https://expressjs.com/
• Sails.js: https://sailsjs.com/
• Unit Testing: https://jestjs.io/
• Continuous Integration: https://en.wikipedia.org/wiki/Continuous_integration
• Deployment: https://en.wikipedia.org/wiki/Software_deployment
• Hosting: https://en.wikipedia.org/wiki/Web_hosting
• Security: https://en.wikipedia.org/wiki/Computer_security
• Microservices Architecture: https://en.wikipedia.org/wiki/Microservices_architecture
• Cloud Computing: https://en.wikipedia.org/wiki/Cloud_computing
• Big Data: https://en.wikipedia.org/wiki/Big_data
• Machine Learning: https://en.wikipedia.org/wiki/Machine_learning
• DevOps: https://en.wikipedia.org/wiki/DevOps

I hope this helps!