I'm not the person you asked, but I do the same using Emacs' org-mode[0], but there are many tools around such as the Leo Editor[1], or really, any editor with a decent markup language support will do.
I store all my org files in git repositories and sync them across devices, allowing me to work on multiple devices and worry less about losing a particular device.
Tried this for a while, but unless I have the window open, I don't use it. I use Wunderlist to track the "projects" that I have in my head at any point in time.
I store all my org files in git repositories and sync them across devices, allowing me to work on multiple devices and worry less about losing a particular device.
[0] https://karl-voit.at/orgmode/
[1] https://leoeditor.com/