A six-guide learning path
Programming foundations
Start with inputs, state, asynchronous work, and tests. These guides use small examples you can reason about without adopting a whole new stack.
Step 1
Validate JavaScript inputs at the boundary
Turn unknown input into a small explicit contract before it reaches application logic.
Read the guide →Step 2
Handle async failures without losing user work
Design pending, success, and failure states for a small asynchronous workflow.
Read the guide →Step 3
Model UI state before adding features
Use an explicit state model to avoid contradictory screens and confusing retry behavior.
Read the guide →Step 4
Use SQL constraints to prevent duplicate work
Let the database enforce uniqueness when concurrent requests can reach the same operation.
Read the guide →Step 5
Write tests around meaningful user outcomes
Choose tests that catch failures a real user or operator would care about.
Read the guide →Step 6
Build a form that works with keyboard and errors
Make labels, validation, and status messages part of the first implementation.
Read the guide →Make the path concrete
Choose one exercise and use your own project as the example. The free scorecard and interactive tools help turn reading into a next decision.