I would be totally lost without this app (both for iOS and MacOS).
It helps me organize my life in a way that makes sense: by areas of responsibility, projects, and tasks. Tasks can have due dates, as well as start dates, and everything is oriented (at least for me) around the "today" screen.
You can also mark tasks to be done "this evening", which is quite useful.
I couldn't live without this app.
Microsoft VS Code
VS Code by Microsoft is the best text editor on planet earth. Sublime Text 3 is a close second.
My reasonings behind saying that are quite multi–faceted, but if you haven't given it a real try, I highly recommend you do so.
Bonus: It's available for MacOS, Windows, and Linux.