There are a lot of articles and techniques developed to help you focus and optimize your time so you can get the most out of your day - some require apps like Trello or it can be simple as using pen and paper.
I went through several different techniques and I found that the Pomodoro Technique for managing your time and to-do lists is one of the simplest and effective ways for me to get work done without making pretty boards or fussing with apps. Sometimes I spend more time figuring out the app then working, maybe you can relate.
To break it down for you, this time management system was developed by Francesco Cirillo in the late 1980's the underlying principles is this: