When I started making games I used a .txt file as a todo list, then I moved to Trello, after that I used Notion and now I'm back to .txt files. I crave simplicity.
@grumpygamer ... and which program do you use to edit txt files? I started with DOS edit command, then Windows' Notepad, then Notepad++, and now back to... nope, Notepad++ is simply the best.