You have great advice here. This is how I do it. Create todo.txt and put everything you need to do in there. Make sure it's reasonably comprehensive and then start crossing things off. A productivity book will tell you the same thing in 200+ pages. If you save the finished items, you may be amazed by what you have accomplished. I had an app for this but I found editing todo.txt is faster. Apps like Trello don't have plaintext export. So let's say you finish to-do work for a client, with a text file you can just cut-paste the completed work into Square, Paypal, spreadsheet, whatever the client prefers. I've tried dozens of applications, but none of them will do the work for you ;-) Todo.txt seems antiquated but I found it's easier to make many edits quickly. I indent everything, similar to writing software. This helps me to see the big picture. I have todo.txt on a remote server so all my devices have access to it (no need to "sync") also automated backups that I control.