Hi @DevGamePro You received All good ideas and a plugin advertisement above!
I am a beginner myself, what worked for me in the beginning to get started was using the old fashioned notebook with pen!
Anyways, I am Still waiting for a perfect setup for my game planning in a plugin.
But depends what you are struggling with, if you want to get started with small projects , even a google spreadsheet / excel should work as @RA3ID mentioned!
If you want to plan for longer use jira/notion as @SFDEMIR suggested.
Or if you are specifically looking for asset level planning you can spend some bucks on the plugin @brahmaforge put out!
I would also recommend asking ChatGPT