Use explicit waits
Prefer WebDriverWait over time.sleep().
Pages load unpredictably.
Use stable selectors
IDs and data attributes are usually more reliable than long XPaths.
Handle popups/cookie banners
Detect and click the consent button instead of removing elements via JavaScript.
Store credentials securely
Environment variables or a secrets manager.
Avoid hardcoding passwords.
Verify login success
Check for a dashboard element, profile menu, or URL change.
Don't rely only on page titles.
Handle MFA
Many sites require two-factor authentication.
Selenium can pause and wait for the user to complete the second factor.

If you're trying to automate login for a specific site that you own or are authorized to test, share the login page structure (HTML snippet or element IDs/XPaths), and I can help you build the Selenium part safely.