Hello,
From our experience, here are the common tasks for generic web application development:

1. List both the business and technical requirements from the client/users
2. Make a decision on which technology stack to use
3. Create a wireframe based on the requirements
4. Create the workflow diagram
5. Create the UI design based on the wireframe
6. Design the database
7. Develop the web application (programming)
8. Initial testing at the development environment
9. Migrate to the production environment
10. Final testing on the production environment and delivery (release)

Steps 1–2: The Consulting Phase

Steps 3–4: The Planning Phase

Steps 5–7: The Designing Phase

Steps 8–10: The Testing and Delivery Phase

This cycle will also apply on the web application features updates.