In the Indiehacker & startup scene there is a big obsession with productivity tools and time management. I use Trello for all my most important things. I also use the basic Notes and Reminders app on my Mac, but this only works for a single person...
How does this work?
The more things move to the right, the more serious they become. The "Done" column means shipped to customers and available. "GA" if you will.
I copy & paste links to Drift discussions with customers in the Trello card so I can look up more details. I use a ton of images and check lists to make things clearer.
What I wanted to make clear is that you really do not need anything to fancy to keep track of things.