Bug Bounty Hunting Tip #1- Always read the Source Code
Bug Bounty Hunting Tip #2- Try to Hunt Subdomains
Bug Bounty Hunting Tip #3- Always check the Back-end CMS & backend language (builtwith)
Bug Bounty Hunting Tip #4- Google Dorks is very helpful
Bug Bounty Hunting Tip #5- Check each request and response
Bug Bounty Hunting Tip #6- Active Mind - Out of Box Thinking :)