1) Pick a Frontend Framework: Start by choosing a frontend framework, which users see and interact with. Don’t spend too much time deciding—pick one like React, Angular, or Vue and start building. The most important thing is to get started.

2) Choose a Backend Framework: After you’re comfortable with the frontend, move on to the backend, where your app's data and logic live. If you want to keep things simple, use a Backend-as-a-Service (BaaS) like Firebase.

Moreover, Firebase would also provide you with a DB and deployment options. But if you want to learn how everything works from scratch, try Node.js or Next.js.

3) Learn About Databases: Databases are where your app stores information. You’ll need to decide between SQL (which is great for organized data) and NoSQL (which is more flexible). Pick one and learn how to use it.

4) Learn How to Deploy Your App: One skill that many people overlook is learning how to deploy an app. This means making your app available for others to use on the internet.

You’ll need to understand how to set up servers and use tools like Docker, Kubernetes, or cloud services like AWS, Azure, or Google Cloud.