How do you manage daily To Do list at work?

I have access to Outlook and Office 365 at work. I still don't know what's the efficient way to maintain To Do list for everyday work? What are your tips and how do you manage it?

To provide more context, I have two devices at work. A Linux workstation where I am most active and a windows laptop. I'd be happy to find a solution that is cross-platform (at least web interface)