1️⃣2️⃣ DON'T CHANGE EVERYTHING AT ONCE

Suppose your code has a bug.

Don't change five different things and run it again.

Instead:

👉 Change one thing

👉 Run the program

👉 Observe the result

👉 Understand what changed

This makes it much easier to identify the actual cause.

1️⃣3️⃣ REPRODUCE THE BUG

Before fixing a problem, make sure you can consistently reproduce it.

Ask:

"When exactly does this error happen?"

For example:

❌ It fails sometimes.

Better:

✅ It fails when the input list is empty.

Now you have a specific problem to investigate.

1️⃣4️⃣ FIX THE ROOT CAUSE

Don't just hide the error.

Example:

If a variable becomes "None" unexpectedly, don't simply add code that ignores "None".

Find out:

👉 Why did it become "None"?

Fixing the root cause prevents the same problem from appearing elsewhere.

1️⃣5️⃣ RETEST AFTER FIXING

Your job isn't finished when the error disappears.

Run:

✅ The original test

✅ Normal cases

✅ Edge cases

✅ Related functionality

A fix can sometimes create a new bug.

🔥 THE DEBUGGING FORMULA

Read the error

↓

Find the location

↓

Understand the error

↓

Check variables & data types

↓

Reproduce the problem

↓

Test with simple input

↓

Debug step by step

↓

Fix the root cause

↓

Test again

💡 REMEMBER:

Every programmer writes buggy code.

The difference between a beginner and an experienced programmer isn't that experienced programmers never make mistakes.

They know how to find, understand, and fix them.

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