I am using Standard Notes currently but I don’t want to pay 10$/month.
Edit: Guys thank you all for your suggestions. Unfortunately I couldn’t find a one-size-fits-all approach like Google Keep or Apple Notes. I realized that we really dont have much choice as an open source community. They either don’t look polished or come at a higher price than I want to pay. Oh and if I see another electron app I am going to scream.
I decided to close my Standard Notes account and started using Gnome Text Editor (it does more than you think) with Syncthing. I am using Markor on my Android end. But it is not really a reliable solution since Syncthing consumes more battery than your average notes app and its GTK client is cumbersome. So even though my quest will continue, I am done for now.
I use Joplin too. You can use it on multiple devices and store your notebook on Nextcloud or Dropbox as excepted files that are decrypted on your device.
My requirement was to be able to write notes and also make checklists that can be checked and unchecked for use with grocery lists, and Joplin is awesome for that.